diff --git a/ebook_converter/css_selectors/select.py b/ebook_converter/css_selectors/select.py
index a1468ed..95f81a6 100644
--- a/ebook_converter/css_selectors/select.py
+++ b/ebook_converter/css_selectors/select.py
@@ -9,8 +9,6 @@ from ebook_converter.css_selectors.errors import ExpressionError
 from ebook_converter.css_selectors.parser import parse, ascii_lower, Element, FunctionalPseudoElement
 from ebook_converter.css_selectors.ordered_set import OrderedSet
 
-from ebook_converter.polyglot.builtins import iteritems, itervalues
-
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
@@ -149,7 +147,7 @@ class Select(object):
         self.invalidate_caches()
         self.default_lang = default_lang
         if trace:
-            self.dispatch_map = {k:trace_wrapper(v) for k, v in iteritems(self.dispatch_map)}
+            self.dispatch_map = {k:trace_wrapper(v) for k, v in self.dispatch_map.items()}
         if ignore_inappropriate_pseudo_classes:
             self.ignore_inappropriate_pseudo_classes = INAPPROPRIATE_PSEUDO_CLASSES
         else:
@@ -237,7 +235,7 @@ class Select(object):
                 def map_attrib_name(x):
                     return ascii_lower(x.rpartition('}')[2])
             for tag in self.itertag():
-                for attr, val in iteritems(tag.attrib):
+                for attr, val in tag.attrib.items():
                     am[map_attrib_name(attr)][val].add(tag)
         return self._attrib_map
 
@@ -250,7 +248,7 @@ class Select(object):
                 def map_attrib_name(x):
                     return ascii_lower(x.rpartition('}')[2])
             for tag in self.itertag():
-                for attr, val in iteritems(tag.attrib):
+                for attr, val in tag.attrib.items():
                     for v in val.split():
                         am[map_attrib_name(attr)][v].add(tag)
         return self._attrib_space_map
@@ -269,7 +267,7 @@ class Select(object):
                     lang = normalize_language_tag(lang)
                     for dtag in self.itertag(tag):
                         lmap[dtag] = lang
-            for tag, langs in iteritems(lmap):
+            for tag, langs in lmap.items():
                 for lang in langs:
                     lm[lang].add(tag)
         return self._lang_map
@@ -426,7 +424,7 @@ def select_attrib(cache, selector):
 
 
 def select_exists(cache, attrib, value=None):
-    for elem_set in itervalues(cache.attrib_map[attrib]):
+    for elem_set in cache.attrib_map[attrib].values():
         for elem in elem_set:
             yield elem
 
@@ -444,7 +442,7 @@ def select_includes(cache, attrib, value):
 
 def select_dashmatch(cache, attrib, value):
     if value:
-        for val, elem_set in iteritems(cache.attrib_map[attrib]):
+        for val, elem_set in cache.attrib_map[attrib].items():
             if val == value or val.startswith(value + '-'):
                 for elem in elem_set:
                     yield elem
@@ -452,7 +450,7 @@ def select_dashmatch(cache, attrib, value):
 
 def select_prefixmatch(cache, attrib, value):
     if value:
-        for val, elem_set in iteritems(cache.attrib_map[attrib]):
+        for val, elem_set in cache.attrib_map[attrib].items():
             if val.startswith(value):
                 for elem in elem_set:
                     yield elem
@@ -460,7 +458,7 @@ def select_prefixmatch(cache, attrib, value):
 
 def select_suffixmatch(cache, attrib, value):
     if value:
-        for val, elem_set in iteritems(cache.attrib_map[attrib]):
+        for val, elem_set in cache.attrib_map[attrib].items():
             if val.endswith(value):
                 for elem in elem_set:
                     yield elem
@@ -468,7 +466,7 @@ def select_suffixmatch(cache, attrib, value):
 
 def select_substringmatch(cache, attrib, value):
     if value:
-        for val, elem_set in iteritems(cache.attrib_map[attrib]):
+        for val, elem_set in cache.attrib_map[attrib].items():
             if value in val:
                 for elem in elem_set:
                     yield elem
@@ -505,7 +503,7 @@ def select_lang(cache, function):
     if lang:
         lang = ascii_lower(lang)
         lp = lang + '-'
-        for tlang, elem_set in iteritems(cache.lang_map):
+        for tlang, elem_set in cache.lang_map.items():
             if tlang == lang or (tlang is not None and tlang.startswith(lp)):
                 for elem in elem_set:
                     yield elem
diff --git a/ebook_converter/customize/ui.py b/ebook_converter/customize/ui.py
index 770cf3d..3ea692f 100644
--- a/ebook_converter/customize/ui.py
+++ b/ebook_converter/customize/ui.py
@@ -18,7 +18,6 @@ from ebook_converter.utils.config import (make_config_dir, Config, ConfigProxy,
                                  plugin_dir, OptionParser)
 # from ebook_converter.ebooks.metadata.sources.base import Source
 from ebook_converter.constants import DEBUG, numeric_version
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -347,7 +346,7 @@ def reread_metadata_plugins():
         return (1 if plugin.plugin_path is None else 0), plugin.name
 
     for group in (_metadata_readers, _metadata_writers):
-        for plugins in itervalues(group):
+        for plugins in group.values():
             if len(plugins) > 1:
                 plugins.sort(key=key)
 
@@ -640,7 +639,7 @@ def patch_metadata_plugins(possibly_updated_plugins):
                     # Metadata source plugins dont use initialize() but that
                     # might change in the future, so be safe.
                     patches[i].initialize()
-    for i, pup in iteritems(patches):
+    for i, pup in patches.items():
         _initialized_plugins[i] = pup
 # }}}
 
diff --git a/ebook_converter/customize/zipplugin.py b/ebook_converter/customize/zipplugin.py
index 9f129e7..ddc9f10 100644
--- a/ebook_converter/customize/zipplugin.py
+++ b/ebook_converter/customize/zipplugin.py
@@ -11,7 +11,7 @@ from ebook_converter import as_unicode
 from ebook_converter.constants import ispy3
 from ebook_converter.customize import (Plugin, numeric_version, platform,
         InvalidPlugin, PluginNotFound)
-from ebook_converter.polyglot.builtins import itervalues, reload
+from ebook_converter.polyglot.builtins import reload
 
 
 __license__ = 'GPL v3'
@@ -199,7 +199,7 @@ class PluginLoader(object):
             else:
                 m = importlib.import_module(plugin_module)
             plugin_classes = []
-            for obj in itervalues(m.__dict__):
+            for obj in m.__dict__.values():
                 if isinstance(obj, type) and issubclass(obj, Plugin) and \
                         obj.name != 'Trivial Plugin':
                     plugin_classes.append(obj)
diff --git a/ebook_converter/ebooks/conversion/cli.py b/ebook_converter/ebooks/conversion/cli.py
index d77957f..9eac4cd 100644
--- a/ebook_converter/ebooks/conversion/cli.py
+++ b/ebook_converter/ebooks/conversion/cli.py
@@ -11,7 +11,6 @@ from ebook_converter.customize.conversion import OptionRecommendation
 from ebook_converter import patheq
 from ebook_converter.ebooks.conversion import ConversionUserFeedBack
 from ebook_converter.utils.localization import localize_user_manual_link
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL 3'
@@ -254,7 +253,7 @@ def add_pipeline_options(parser, plumber):
 
               ))
 
-    for group, (desc, options) in iteritems(groups):
+    for group, (desc, options) in groups.items():
         if group:
             group = OptionGroup(parser, group, desc)
             parser.add_option_group(group)
diff --git a/ebook_converter/ebooks/conversion/plugins/fb2_input.py b/ebook_converter/ebooks/conversion/plugins/fb2_input.py
index 76550fe..a273cff 100644
--- a/ebook_converter/ebooks/conversion/plugins/fb2_input.py
+++ b/ebook_converter/ebooks/conversion/plugins/fb2_input.py
@@ -6,7 +6,6 @@ import pkg_resources
 
 from ebook_converter.customize.conversion import InputFormatPlugin, OptionRecommendation
 from ebook_converter import guess_type
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -105,7 +104,7 @@ class FB2Input(InputFormatPlugin):
         notes = {a.get('href')[1:]: a for a in result.xpath('//a[@link_note and @href]') if a.get('href').startswith('#')}
         cites = {a.get('link_cite'): a for a in result.xpath('//a[@link_cite]') if not a.get('href', '')}
         all_ids = {x for x in result.xpath('//*/@id')}
-        for cite, a in iteritems(cites):
+        for cite, a in cites.items():
             note = notes.get(cite, None)
             if note:
                 c = 1
diff --git a/ebook_converter/ebooks/conversion/plugins/pdf_output.py b/ebook_converter/ebooks/conversion/plugins/pdf_output.py
index d1d17c3..b002df3 100644
--- a/ebook_converter/ebooks/conversion/plugins/pdf_output.py
+++ b/ebook_converter/ebooks/conversion/plugins/pdf_output.py
@@ -6,7 +6,6 @@ import glob, os
 from ebook_converter.customize.conversion import (OutputFormatPlugin,
     OptionRecommendation)
 from ebook_converter.ptempfile import TemporaryDirectory
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL 3'
@@ -234,7 +233,7 @@ class PDFOutput(OutputFormatPlugin):
         self.process_fonts()
 
         if self.opts.pdf_use_document_margins and self.stored_page_margins:
-            for href, margins in iteritems(self.stored_page_margins):
+            for href, margins in self.stored_page_margins.items():
                 item = oeb_book.manifest.hrefs.get(href)
                 if item is not None:
                     root = item.data
diff --git a/ebook_converter/ebooks/conversion/plugins/rtf_input.py b/ebook_converter/ebooks/conversion/plugins/rtf_input.py
index f15077f..253e7a0 100644
--- a/ebook_converter/ebooks/conversion/plugins/rtf_input.py
+++ b/ebook_converter/ebooks/conversion/plugins/rtf_input.py
@@ -2,7 +2,7 @@ import os, glob, re, textwrap
 import pkg_resources
 
 from ebook_converter.customize.conversion import InputFormatPlugin, OptionRecommendation
-from ebook_converter.polyglot.builtins import iteritems, as_bytes
+from ebook_converter.polyglot.builtins import as_bytes
 
 __license__ = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
@@ -147,7 +147,7 @@ class RTFInput(InputFormatPlugin):
 
     def convert_images(self, imap):
         self.default_img = None
-        for count, val in iteritems(imap):
+        for count, val in imap.items():
             try:
                 imap[count] = self.convert_image(val)
             except:
@@ -212,7 +212,7 @@ class RTFInput(InputFormatPlugin):
         css += '\n'+'\n'.join(font_size_classes)
         css += '\n' +'\n'.join(color_classes)
 
-        for cls, val in iteritems(border_styles):
+        for cls, val in border_styles.items():
             css += '\n\n.%s {\n%s\n}'%(cls, val)
 
         with open(u'styles.css', 'ab') as f:
diff --git a/ebook_converter/ebooks/covers.py b/ebook_converter/ebooks/covers.py
index 6794bb8..71bd30d 100644
--- a/ebook_converter/ebooks/covers.py
+++ b/ebook_converter/ebooks/covers.py
@@ -2,7 +2,6 @@ import re, random, unicodedata, numbers
 from collections import namedtuple
 from contextlib import contextmanager
 from math import ceil, sqrt, cos, sin, atan2
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 from itertools import chain
 
 from PyQt5.Qt import (
@@ -277,7 +276,7 @@ def preserve_fields(obj, fields):
     try:
         yield
     finally:
-        for f, val in iteritems(mem):
+        for f, val in mem.items():
             if val is null:
                 delattr(obj, f)
             else:
@@ -319,10 +318,10 @@ def load_color_themes(prefs):
     t = default_color_themes.copy()
     t.update(prefs.color_themes)
     disabled = frozenset(prefs.disabled_color_themes)
-    ans = [theme_to_colors(v) for k, v in iteritems(t) if k not in disabled]
+    ans = [theme_to_colors(v) for k, v in t.items() if k not in disabled]
     if not ans:
         # Ignore disabled and return only the builtin color themes
-        ans = [theme_to_colors(v) for k, v in iteritems(default_color_themes)]
+        ans = [theme_to_colors(v) for k, v in default_color_themes.items()]
     return ans
 
 
@@ -559,14 +558,14 @@ class Blocks(Style):
 
 def all_styles():
     return set(
-        x.NAME for x in itervalues(globals()) if
+        x.NAME for x in globals().values() if
         isinstance(x, type) and issubclass(x, Style) and x is not Style
     )
 
 
 def load_styles(prefs, respect_disabled=True):
     disabled = frozenset(prefs.disabled_styles) if respect_disabled else ()
-    ans = tuple(x for x in itervalues(globals()) if
+    ans = tuple(x for x in globals().values() if
             isinstance(x, type) and issubclass(x, Style) and x is not Style and x.NAME not in disabled)
     if not ans and disabled:
         # If all styles have been disabled, ignore the disabling and return all
diff --git a/ebook_converter/ebooks/docx/block_styles.py b/ebook_converter/ebooks/docx/block_styles.py
index e7e2ba1..ede3763 100644
--- a/ebook_converter/ebooks/docx/block_styles.py
+++ b/ebook_converter/ebooks/docx/block_styles.py
@@ -1,6 +1,5 @@
 import numbers
 from collections import OrderedDict
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -133,11 +132,11 @@ def read_border(parent, dest, XPath, get, border_edges=border_edges, name='pBdr'
 
     for border in XPath('./w:' + name)(parent):
         for edge in border_edges:
-            for prop, val in iteritems(read_single_border(border, edge, XPath, get)):
+            for prop, val in read_single_border(border, edge, XPath, get).items():
                 if val is not None:
                     vals[prop % edge] = val
 
-    for key, val in iteritems(vals):
+    for key, val in vals.items():
         setattr(dest, key, val)
 
 
@@ -472,4 +471,4 @@ class ParagraphStyle(object):
         return False
 
 
-read_funcs = {k[5:]:v for k, v in iteritems(globals()) if k.startswith('read_')}
+read_funcs = {k[5:]:v for k, v in globals().items() if k.startswith('read_')}
diff --git a/ebook_converter/ebooks/docx/cleanup.py b/ebook_converter/ebooks/docx/cleanup.py
index 1b5a4a4..1d65c2a 100644
--- a/ebook_converter/ebooks/docx/cleanup.py
+++ b/ebook_converter/ebooks/docx/cleanup.py
@@ -1,5 +1,4 @@
 import os
-from ebook_converter.polyglot.builtins import itervalues
 
 
 __license__ = 'GPL v3'
@@ -143,7 +142,7 @@ def cleanup_markup(log, root, styles, dest_dir, detect_cover, XPath):
                 current_run = [span]
 
     # Process dir attributes
-    class_map = dict(itervalues(styles.classes))
+    class_map = dict(styles.classes.values())
     parents = ('p', 'div') + tuple('h%d' % i for i in range(1, 7))
     for parent in root.xpath('//*[(%s)]' % ' or '.join('name()="%s"' % t for t in parents)):
         # Ensure that children of rtl parents that are not rtl have an
diff --git a/ebook_converter/ebooks/docx/fields.py b/ebook_converter/ebooks/docx/fields.py
index 99d7e93..09b5d2f 100644
--- a/ebook_converter/ebooks/docx/fields.py
+++ b/ebook_converter/ebooks/docx/fields.py
@@ -1,7 +1,7 @@
 import re
 
 from ebook_converter.ebooks.docx.index import process_index, polish_index_markup
-from ebook_converter.polyglot.builtins import iteritems, native_string_type
+from ebook_converter.polyglot.builtins import native_string_type
 
 
 __license__ = 'GPL v3'
@@ -234,7 +234,7 @@ class Fields(object):
     def polish_markup(self, object_map):
         if not self.index_fields:
             return
-        rmap = {v:k for k, v in iteritems(object_map)}
+        rmap = {v:k for k, v in object_map.items()}
         for idx, blocks in self.index_fields:
             polish_index_markup(idx, [rmap[b] for b in blocks])
 
diff --git a/ebook_converter/ebooks/docx/fonts.py b/ebook_converter/ebooks/docx/fonts.py
index 3c5e3fb..7cfac58 100644
--- a/ebook_converter/ebooks/docx/fonts.py
+++ b/ebook_converter/ebooks/docx/fonts.py
@@ -6,7 +6,6 @@ from ebook_converter.utils.filenames import ascii_filename
 from ebook_converter.utils.fonts.scanner import font_scanner, NoFonts
 from ebook_converter.utils.fonts.utils import panose_to_css_generic_family, is_truetype_font
 from ebook_converter.utils.icu import ord_string
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -168,7 +167,7 @@ class Fonts(object):
                         d['font-weight'] = 'bold'
                     if 'Italic' in variant:
                         d['font-style'] = 'italic'
-                    d = ['%s: %s' % (k, v) for k, v in iteritems(d)]
+                    d = ['%s: %s' % (k, v) for k, v in d.items()]
                     d = ';\n\t'.join(d)
                     defs.append('@font-face {\n\t%s\n}\n' % d)
         return '\n'.join(defs)
diff --git a/ebook_converter/ebooks/docx/footnotes.py b/ebook_converter/ebooks/docx/footnotes.py
index fe69211..65520c8 100644
--- a/ebook_converter/ebooks/docx/footnotes.py
+++ b/ebook_converter/ebooks/docx/footnotes.py
@@ -1,5 +1,4 @@
 from collections import OrderedDict
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -54,7 +53,7 @@ class Footnotes(object):
         return None, None
 
     def __iter__(self):
-        for anchor, (counter, note) in iteritems(self.notes):
+        for anchor, (counter, note) in self.notes.items():
             yield anchor, counter, note
 
     @property
diff --git a/ebook_converter/ebooks/docx/images.py b/ebook_converter/ebooks/docx/images.py
index 33514ca..4432062 100644
--- a/ebook_converter/ebooks/docx/images.py
+++ b/ebook_converter/ebooks/docx/images.py
@@ -7,7 +7,6 @@ from ebook_converter.ebooks.docx.names import barename
 from ebook_converter.utils.filenames import ascii_filename
 from ebook_converter.utils.img import resize_to_fit, image_to_data
 from ebook_converter.utils.imghdr import what
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -63,7 +62,7 @@ def get_image_properties(parent, XPath, get):
 
 def get_image_margins(elem):
     ans = {}
-    for w, css in iteritems({'L':'left', 'T':'top', 'R':'right', 'B':'bottom'}):
+    for w, css in {'L':'left', 'T':'top', 'R':'right', 'B':'bottom'}.items():
         val = elem.get('dist%s' % w, None)
         if val is not None:
             try:
@@ -154,7 +153,7 @@ class Images(object):
         return raw, base
 
     def unique_name(self, base):
-        exists = frozenset(itervalues(self.used))
+        exists = frozenset(self.used.values())
         c = 1
         name = base
         while name in exists:
@@ -239,7 +238,7 @@ class Images(object):
                 ans = self.pic_to_img(pic, alt, inline, title)
                 if ans is not None:
                     if style:
-                        ans.set('style', '; '.join('%s: %s' % (k, v) for k, v in iteritems(style)))
+                        ans.set('style', '; '.join('%s: %s' % (k, v) for k, v in style.items()))
                     yield ans
 
         # Now process the floats
@@ -250,7 +249,7 @@ class Images(object):
                 ans = self.pic_to_img(pic, alt, anchor, title)
                 if ans is not None:
                     if style:
-                        ans.set('style', '; '.join('%s: %s' % (k, v) for k, v in iteritems(style)))
+                        ans.set('style', '; '.join('%s: %s' % (k, v) for k, v in style.items()))
                     yield ans
 
     def pict_to_html(self, pict, page):
@@ -272,7 +271,7 @@ class Images(object):
                 style['margin-left'] = '0' if align == 'left' else 'auto'
                 style['margin-right'] = 'auto' if align == 'left' else '0'
             if style:
-                hr.set('style', '; '.join(('%s:%s' % (k, v) for k, v in iteritems(style))))
+                hr.set('style', '; '.join(('%s:%s' % (k, v) for k, v in style.items())))
             yield hr
 
         for imagedata in XPath('descendant::v:imagedata[@r:id]')(pict):
diff --git a/ebook_converter/ebooks/docx/index.py b/ebook_converter/ebooks/docx/index.py
index 92cc092..f70535a 100644
--- a/ebook_converter/ebooks/docx/index.py
+++ b/ebook_converter/ebooks/docx/index.py
@@ -3,7 +3,6 @@ from operator import itemgetter
 from lxml import etree
 
 from ebook_converter.utils.icu import partition_by_first_letter, sort_key
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -99,7 +98,7 @@ def process_index(field, index, xe_fields, log, XPath, expand):
     if heading_text is not None:
         groups = partition_by_first_letter(xe_fields, key=itemgetter('text'))
         items = []
-        for key, fields in iteritems(groups):
+        for key, fields in groups.items():
             items.append(key), items.extend(fields)
         if styles:
             heading_style = styles[0]
diff --git a/ebook_converter/ebooks/docx/names.py b/ebook_converter/ebooks/docx/names.py
index 8455f7d..618b82b 100644
--- a/ebook_converter/ebooks/docx/names.py
+++ b/ebook_converter/ebooks/docx/names.py
@@ -3,7 +3,6 @@ import re
 from lxml.etree import XPath as X
 
 from ebook_converter.utils.filenames import ascii_text
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -29,7 +28,7 @@ TRANSITIONAL_NAMES = {
 
 STRICT_NAMES = {
     k:v.replace('http://schemas.openxmlformats.org/officeDocument/2006',  'http://purl.oclc.org/ooxml/officeDocument')
-    for k, v in iteritems(TRANSITIONAL_NAMES)
+    for k, v in TRANSITIONAL_NAMES.items()
 }
 
 TRANSITIONAL_NAMESPACES = {
@@ -69,7 +68,7 @@ STRICT_NAMESPACES = {
         'http://schemas.openxmlformats.org/officeDocument/2006', 'http://purl.oclc.org/ooxml/officeDocument').replace(
         'http://schemas.openxmlformats.org/wordprocessingml/2006', 'http://purl.oclc.org/ooxml/wordprocessingml').replace(
         'http://schemas.openxmlformats.org/drawingml/2006', 'http://purl.oclc.org/ooxml/drawingml')
-    for k, v in iteritems(TRANSITIONAL_NAMESPACES)
+    for k, v in TRANSITIONAL_NAMESPACES.items()
 }
 # }}}
 
@@ -135,7 +134,7 @@ class DOCXNamespace(object):
         return self.XPath('|'.join('descendant::%s' % a for a in args))(elem)
 
     def makeelement(self, root, tag, append=True, **attrs):
-        ans = root.makeelement(self.expand(tag), **{self.expand(k, sep='_'):v for k, v in iteritems(attrs)})
+        ans = root.makeelement(self.expand(tag), **{self.expand(k, sep='_'):v for k, v in attrs.items()})
         if append:
             root.append(ans)
         return ans
diff --git a/ebook_converter/ebooks/docx/numbering.py b/ebook_converter/ebooks/docx/numbering.py
index a09c019..2391797 100644
--- a/ebook_converter/ebooks/docx/numbering.py
+++ b/ebook_converter/ebooks/docx/numbering.py
@@ -7,7 +7,6 @@ from lxml.html.builder import OL, UL, SPAN
 from ebook_converter.ebooks.docx.block_styles import ParagraphStyle
 from ebook_converter.ebooks.docx.char_styles import RunStyle, inherit
 from ebook_converter.ebooks.metadata import roman
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -166,7 +165,7 @@ class NumberingDefinition(object):
 
     def copy(self):
         ans = NumberingDefinition(self.namespace, an_id=self.abstract_numbering_definition_id)
-        for l, lvl in iteritems(self.levels):
+        for l, lvl in self.levels.items():
             ans.levels[l] = lvl.copy()
         return ans
 
@@ -222,7 +221,7 @@ class Numbering(object):
                     if alvl is None:
                         alvl = Level(self.namespace)
                     alvl.read_from_xml(lvl, override=True)
-            for ilvl, so in iteritems(start_overrides):
+            for ilvl, so in start_overrides.items():
                 try:
                     nd.levels[ilvl].start = start_override
                 except KeyError:
@@ -242,22 +241,22 @@ class Numbering(object):
             self.instances[num_id] = create_instance(n, d)
 
         numbering_links = styles.numbering_style_links
-        for an_id, style_link in iteritems(lazy_load):
+        for an_id, style_link in lazy_load.items():
             num_id = numbering_links[style_link]
             self.definitions[an_id] = self.instances[num_id].copy()
 
-        for num_id, (an_id, n) in iteritems(next_pass):
+        for num_id, (an_id, n) in next_pass.items():
             d = self.definitions.get(an_id, None)
             if d is not None:
                 self.instances[num_id] = create_instance(n, d)
 
-        for num_id, d in iteritems(self.instances):
+        for num_id, d in self.instances.items():
             self.starts[num_id] = {lvl:d.levels[lvl].start for lvl in d.levels}
 
     def get_pstyle(self, num_id, style_id):
         d = self.instances.get(num_id, None)
         if d is not None:
-            for ilvl, lvl in iteritems(d.levels):
+            for ilvl, lvl in d.levels.items():
                 if lvl.para_link == style_id:
                     return ilvl
 
@@ -269,7 +268,7 @@ class Numbering(object):
 
     def update_counter(self, counter, levelnum, levels):
         counter[levelnum] += 1
-        for ilvl, lvl in iteritems(levels):
+        for ilvl, lvl in levels.items():
             restart = lvl.restart
             if (restart is None and ilvl == levelnum + 1) or restart == levelnum + 1:
                 counter[ilvl] = lvl.start
diff --git a/ebook_converter/ebooks/docx/styles.py b/ebook_converter/ebooks/docx/styles.py
index d7b909b..7951d80 100644
--- a/ebook_converter/ebooks/docx/styles.py
+++ b/ebook_converter/ebooks/docx/styles.py
@@ -4,7 +4,6 @@ from collections import OrderedDict, Counter
 from ebook_converter.ebooks.docx.block_styles import ParagraphStyle, inherit, twips
 from ebook_converter.ebooks.docx.char_styles import RunStyle
 from ebook_converter.ebooks.docx.tables import TableStyle
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -121,7 +120,7 @@ class Styles(object):
         self.default_paragraph_style = self.default_character_style = None
 
     def __iter__(self):
-        for s in itervalues(self.id_map):
+        for s in self.id_map.values():
             yield s
 
     def __getitem__(self, key):
@@ -340,7 +339,7 @@ class Styles(object):
                     setattr(s, prop, inherit)
                 setattr(block_style, prop, next(iter(vals)))
 
-        for p, runs in iteritems(layers):
+        for p, runs in layers.items():
             has_links = '1' in {r.get('is-link', None) for r in runs}
             char_styles = [self.resolve_run(r) for r in runs]
             block_style = self.resolve_paragraph(p)
@@ -420,7 +419,7 @@ class Styles(object):
             ps.pageBreakBefore = True
 
     def register(self, css, prefix):
-        h = hash(frozenset(iteritems(css)))
+        h = hash(frozenset(css.items()))
         ans, _ = self.classes.get(h, (None, None))
         if ans is None:
             self.counter[prefix] += 1
@@ -429,17 +428,17 @@ class Styles(object):
         return ans
 
     def generate_classes(self):
-        for bs in itervalues(self.para_cache):
+        for bs in self.para_cache.values():
             css = bs.css
             if css:
                 self.register(css, 'block')
-        for bs in itervalues(self.run_cache):
+        for bs in self.run_cache.values():
             css = bs.css
             if css:
                 self.register(css, 'text')
 
     def class_name(self, css):
-        h = hash(frozenset(iteritems(css)))
+        h = hash(frozenset(css.items()))
         return self.classes.get(h, (None, None))[0]
 
     def generate_css(self, dest_dir, docx, notes_nopb, nosupsub):
@@ -494,8 +493,8 @@ class Styles(object):
             prefix = ef + '\n' + prefix
 
         ans = []
-        for (cls, css) in sorted(itervalues(self.classes), key=lambda x:x[0]):
-            b = ('\t%s: %s;' % (k, v) for k, v in iteritems(css))
+        for (cls, css) in sorted(self.classes.values(), key=lambda x:x[0]):
+            b = ('\t%s: %s;' % (k, v) for k, v in css.items())
             b = '\n'.join(b)
             ans.append('.%s {\n%s\n}\n' % (cls, b.rstrip(';')))
         return prefix + '\n' + '\n'.join(ans)
diff --git a/ebook_converter/ebooks/docx/tables.py b/ebook_converter/ebooks/docx/tables.py
index 8b0fd81..00369ef 100644
--- a/ebook_converter/ebooks/docx/tables.py
+++ b/ebook_converter/ebooks/docx/tables.py
@@ -2,7 +2,6 @@ from lxml.html.builder import TABLE, TR, TD
 
 from ebook_converter.ebooks.docx.block_styles import inherit, read_shd as rs, read_border, binary_property, border_props, ParagraphStyle, border_to_css
 from ebook_converter.ebooks.docx.char_styles import RunStyle
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -82,7 +81,7 @@ def read_spacing(parent, dest, XPath, get):
 def read_float(parent, dest, XPath, get):
     ans = inherit
     for x in XPath('./w:tblpPr')(parent):
-        ans = {k.rpartition('}')[-1]: v for k, v in iteritems(x.attrib)}
+        ans = {k.rpartition('}')[-1]: v for k, v in x.attrib.items()}
     setattr(dest, 'float', ans)
 
 
@@ -614,7 +613,7 @@ class Table(object):
     def __iter__(self):
         for p in self.paragraphs:
             yield p
-        for t in itervalues(self.sub_tables):
+        for t in self.sub_tables.values():
             for p in t:
                 yield p
 
@@ -661,7 +660,7 @@ class Table(object):
         table_style = self.table_style.css
         if table_style:
             table.set('class', self.styles.register(table_style, 'table'))
-        for elem, style in iteritems(style_map):
+        for elem, style in style_map.items():
             css = style.css
             if css:
                 elem.set('class', self.styles.register(css, elem.tag))
@@ -682,7 +681,7 @@ class Tables(object):
         self.sub_tables |= set(self.tables[-1].sub_tables)
 
     def apply_markup(self, object_map, page_map):
-        rmap = {v:k for k, v in iteritems(object_map)}
+        rmap = {v:k for k, v in object_map.items()}
         for table in self.tables:
             table.apply_markup(rmap, page_map[table.tbl])
 
diff --git a/ebook_converter/ebooks/docx/to_html.py b/ebook_converter/ebooks/docx/to_html.py
index f574266..1b565ba 100644
--- a/ebook_converter/ebooks/docx/to_html.py
+++ b/ebook_converter/ebooks/docx/to_html.py
@@ -21,7 +21,6 @@ from ebook_converter.ebooks.docx.fields import Fields
 from ebook_converter.ebooks.docx.settings import Settings
 from ebook_converter.ebooks.metadata.opf2 import OPFCreator
 from ebook_converter.utils.localization import canonicalize_lang, lang_as_iso639_1
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -119,7 +118,7 @@ class Convert(object):
 
         self.read_page_properties(doc)
         self.current_rels = relationships_by_id
-        for wp, page_properties in iteritems(self.page_map):
+        for wp, page_properties in self.page_map.items():
             self.current_page = page_properties
             if wp.tag.endswith('}p'):
                 p = self.convert_p(wp)
@@ -159,7 +158,7 @@ class Convert(object):
                 self.styles.apply_contextual_spacing(paras)
                 self.mark_block_runs(paras)
 
-        for p, wp in iteritems(self.object_map):
+        for p, wp in self.object_map.items():
             if len(p) > 0 and not p.text and len(p[0]) > 0 and not p[0].text and p[0][0].get('class', None) == 'tab':
                 # Paragraph uses tabs for indentation, convert to text-indent
                 parent = p[0]
@@ -189,7 +188,7 @@ class Convert(object):
         self.tables.apply_markup(self.object_map, self.page_map)
 
         numbered = []
-        for html_obj, obj in iteritems(self.object_map):
+        for html_obj, obj in self.object_map.items():
             raw = obj.get('calibre_num_id', None)
             if raw is not None:
                 lvl, num_id = raw.partition(':')[0::2]
@@ -209,7 +208,7 @@ class Convert(object):
 
         self.log.debug('Converting styles to CSS')
         self.styles.generate_classes()
-        for html_obj, obj in iteritems(self.object_map):
+        for html_obj, obj in self.object_map.items():
             style = self.styles.resolve(obj)
             if style is not None:
                 css = style.css
@@ -217,7 +216,7 @@ class Convert(object):
                     cls = self.styles.class_name(css)
                     if cls:
                         html_obj.set('class', cls)
-        for html_obj, css in iteritems(self.framed_map):
+        for html_obj, css in self.framed_map.items():
             cls = self.styles.class_name(css)
             if cls:
                 html_obj.set('class', cls)
@@ -404,13 +403,13 @@ class Convert(object):
         doc_anchors = frozenset(self.namespace.XPath('./w:body/w:bookmarkStart[@w:name]')(doc))
         if doc_anchors:
             current_bm = set()
-            rmap = {v:k for k, v in iteritems(self.object_map)}
+            rmap = {v:k for k, v in self.object_map.items()}
             for p in self.namespace.descendants(doc, 'w:p', 'w:bookmarkStart[@w:name]'):
                 if p.tag.endswith('}p'):
                     if current_bm and p in rmap:
                         para = rmap[p]
                         if 'id' not in para.attrib:
-                            para.set('id', generate_anchor(next(iter(current_bm)), frozenset(itervalues(self.anchor_map))))
+                            para.set('id', generate_anchor(next(iter(current_bm)), frozenset(self.anchor_map.values())))
                         for name in current_bm:
                             self.anchor_map[name] = para.get('id')
                         current_bm = set()
@@ -466,10 +465,10 @@ class Convert(object):
                     # _GoBack is a special bookmark inserted by Word 2010 for
                     # the return to previous edit feature, we ignore it
                     old_anchor = current_anchor
-                    self.anchor_map[anchor] = current_anchor = generate_anchor(anchor, frozenset(itervalues(self.anchor_map)))
+                    self.anchor_map[anchor] = current_anchor = generate_anchor(anchor, frozenset(self.anchor_map.values()))
                     if old_anchor is not None:
                         # The previous anchor was not applied to any element
-                        for a, t in tuple(iteritems(self.anchor_map)):
+                        for a, t in tuple(self.anchor_map.items()):
                             if t == old_anchor:
                                 self.anchor_map[a] = current_anchor
             elif x.tag.endswith('}hyperlink'):
@@ -477,11 +476,11 @@ class Convert(object):
             elif x.tag.endswith('}instrText') and x.text and x.text.strip().startswith('TOC '):
                 old_anchor = current_anchor
                 anchor = str(uuid.uuid4())
-                self.anchor_map[anchor] = current_anchor = generate_anchor('toc', frozenset(itervalues(self.anchor_map)))
+                self.anchor_map[anchor] = current_anchor = generate_anchor('toc', frozenset(self.anchor_map.values()))
                 self.toc_anchor = current_anchor
                 if old_anchor is not None:
                     # The previous anchor was not applied to any element
-                    for a, t in tuple(iteritems(self.anchor_map)):
+                    for a, t in tuple(self.anchor_map.items()):
                         if t == old_anchor:
                             self.anchor_map[a] = current_anchor
         if current_anchor is not None:
@@ -557,7 +556,7 @@ class Convert(object):
 
     def resolve_links(self):
         self.resolved_link_map = {}
-        for hyperlink, spans in iteritems(self.link_map):
+        for hyperlink, spans in self.link_map.items():
             relationships_by_id = self.link_source_map[hyperlink]
             span = spans[0]
             if len(spans) > 1:
@@ -583,7 +582,7 @@ class Convert(object):
             # hrefs that point nowhere give epubcheck a hernia. The element
             # should be styled explicitly by Word anyway.
             # span.set('href', '#')
-        rmap = {v:k for k, v in iteritems(self.object_map)}
+        rmap = {v:k for k, v in self.object_map.items()}
         for hyperlink, runs in self.fields.hyperlink_fields:
             spans = [rmap[r] for r in runs if r in rmap]
             if not spans:
@@ -743,7 +742,7 @@ class Convert(object):
 
         if not self.block_runs:
             return
-        rmap = {v:k for k, v in iteritems(self.object_map)}
+        rmap = {v:k for k, v in self.object_map.items()}
         for border_style, blocks in self.block_runs:
             paras = tuple(rmap[p] for p in blocks)
             for p in paras:
diff --git a/ebook_converter/ebooks/docx/toc.py b/ebook_converter/ebooks/docx/toc.py
index dc517ee..95eff68 100644
--- a/ebook_converter/ebooks/docx/toc.py
+++ b/ebook_converter/ebooks/docx/toc.py
@@ -5,7 +5,6 @@ from lxml.etree import tostring
 
 from ebook_converter.ebooks.metadata.toc import TOC
 from ebook_converter.ebooks.oeb.polish.toc import elem_to_toc_text
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -21,7 +20,7 @@ def from_headings(body, log, namespace, num_levels=3):
     level_item_map = {i:frozenset(
         x for x in all_heading_nodes if int(x.get('data-heading-level')) == i)
         for i in range(1, num_levels+1)}
-    item_level_map = {e:i for i, elems in iteritems(level_item_map) for e in elems}
+    item_level_map = {e:i for i, elems in level_item_map.items() for e in elems}
 
     idcount = count()
 
diff --git a/ebook_converter/ebooks/docx/writer/container.py b/ebook_converter/ebooks/docx/writer/container.py
index 64f0c46..1794dc5 100644
--- a/ebook_converter/ebooks/docx/writer/container.py
+++ b/ebook_converter/ebooks/docx/writer/container.py
@@ -11,7 +11,7 @@ from ebook_converter.ebooks.pdf.render.common import PAPER_SIZES
 from ebook_converter.utils.date import utcnow
 from ebook_converter.utils.localization import canonicalize_lang, lang_as_iso639_1
 from ebook_converter.utils.zipfile import ZipFile
-from ebook_converter.polyglot.builtins import iteritems, native_string_type
+from ebook_converter.polyglot.builtins import native_string_type
 
 
 __license__ = 'GPL v3'
@@ -52,7 +52,7 @@ def create_skeleton(opts, namespaces=None):
 
     def w(x):
         return '{%s}%s' % (namespaces['w'], x)
-    dn = {k:v for k, v in iteritems(namespaces) if k in {'w', 'r', 'm', 've', 'o', 'wp', 'w10', 'wne', 'a', 'pic'}}
+    dn = {k:v for k, v in namespaces.items() if k in {'w', 'r', 'm', 've', 'o', 'wp', 'w10', 'wne', 'a', 'pic'}}
     E = ElementMaker(namespace=dn['w'], nsmap=dn)
     doc = E.document()
     body = E.body()
@@ -70,7 +70,7 @@ def create_skeleton(opts, namespaces=None):
         E.docGrid(**{w('linePitch'):"360"}),
     ))
 
-    dn = {k:v for k, v in iteritems(namespaces) if k in tuple('wra') + ('wp',)}
+    dn = {k:v for k, v in namespaces.items() if k in tuple('wra') + ('wp',)}
     E = ElementMaker(namespace=dn['w'], nsmap=dn)
     styles = E.styles(
         E.docDefaults(
@@ -117,12 +117,11 @@ class DocumentRelationships(object):
     def __init__(self, namespace):
         self.rmap = {}
         self.namespace = namespace
-        for typ, target in iteritems({
-                namespace.names['STYLES']: 'styles.xml',
-                namespace.names['NUMBERING']: 'numbering.xml',
-                namespace.names['WEB_SETTINGS']: 'webSettings.xml',
-                namespace.names['FONTS']: 'fontTable.xml',
-        }):
+        for typ, target in {namespace.names['STYLES']: 'styles.xml',
+                            namespace.names['NUMBERING']: 'numbering.xml',
+                            namespace.names['WEB_SETTINGS']: 'webSettings.xml',
+                            namespace.names['FONTS']: 'fontTable.xml',
+                           }.items():
             self.add_relationship(target, typ)
 
     def get_relationship_id(self, target, rtype, target_mode=None):
@@ -142,7 +141,7 @@ class DocumentRelationships(object):
         namespaces = self.namespace.namespaces
         E = ElementMaker(namespace=namespaces['pr'], nsmap={None:namespaces['pr']})
         relationships = E.Relationships()
-        for (target, rtype, target_mode), rid in iteritems(self.rmap):
+        for (target, rtype, target_mode), rid in self.rmap.items():
             r = E.Relationship(Id=rid, Type=rtype, Target=target)
             if target_mode is not None:
                 r.set('TargetMode', target_mode)
@@ -169,7 +168,7 @@ class DOCX(object):
     def contenttypes(self):
         E = ElementMaker(namespace=self.namespace.namespaces['ct'], nsmap={None:self.namespace.namespaces['ct']})
         types = E.Types()
-        for partname, mt in iteritems({
+        for partname, mt in {
             "/word/footnotes.xml": "application/vnd.openxmlformats-officedocument.wordprocessingml.footnotes+xml",
             "/word/document.xml": "application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml",
             "/word/numbering.xml": "application/vnd.openxmlformats-officedocument.wordprocessingml.numbering+xml",
@@ -181,15 +180,13 @@ class DOCX(object):
             "/word/webSettings.xml": "application/vnd.openxmlformats-officedocument.wordprocessingml.webSettings+xml",
             "/docProps/core.xml": "application/vnd.openxmlformats-package.core-properties+xml",
             "/docProps/app.xml": "application/vnd.openxmlformats-officedocument.extended-properties+xml",
-        }):
+        }.items():
             types.append(E.Override(PartName=partname, ContentType=mt))
         added = {'png', 'gif', 'jpeg', 'jpg', 'svg', 'xml'}
         for ext in added:
             types.append(E.Default(Extension=ext, ContentType=guess_type('a.'+ext)[0]))
-        for ext, mt in iteritems({
-            "rels": "application/vnd.openxmlformats-package.relationships+xml",
-            "odttf": "application/vnd.openxmlformats-officedocument.obfuscatedFont",
-        }):
+        for ext, mt in {"rels": "application/vnd.openxmlformats-package.relationships+xml",
+                        "odttf": "application/vnd.openxmlformats-officedocument.obfuscatedFont"}.items():
             added.add(ext)
             types.append(E.Default(Extension=ext, ContentType=mt))
         for fname in self.images:
@@ -267,9 +264,9 @@ class DOCX(object):
             zf.writestr('word/fontTable.xml', xml2str(self.font_table))
             zf.writestr('word/_rels/document.xml.rels', self.document_relationships.serialize())
             zf.writestr('word/_rels/fontTable.xml.rels', xml2str(self.embedded_fonts))
-            for fname, data_getter in iteritems(self.images):
+            for fname, data_getter in self.images.items():
                 zf.writestr(fname, data_getter())
-            for fname, data in iteritems(self.fonts):
+            for fname, data in self.fonts.items():
                 zf.writestr(fname, data)
 
 
diff --git a/ebook_converter/ebooks/docx/writer/images.py b/ebook_converter/ebooks/docx/writer/images.py
index 20fa1db..19e6e58 100644
--- a/ebook_converter/ebooks/docx/writer/images.py
+++ b/ebook_converter/ebooks/docx/writer/images.py
@@ -2,7 +2,6 @@ import os
 import posixpath
 from collections import namedtuple
 from functools import partial
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 from lxml import etree
 
@@ -127,7 +126,7 @@ class ImagesManager(object):
         if fake_margins:
             # DOCX does not support setting margins for inline images, so we
             # fake it by using effect extents to simulate margins
-            makeelement(parent, 'wp:effectExtent', **{k[-1].lower():v for k, v in iteritems(get_image_margins(style))})
+            makeelement(parent, 'wp:effectExtent', **{k[-1].lower():v for k, v in get_image_margins(style).items()})
         else:
             makeelement(parent, 'wp:effectExtent', l='0', r='0', t='0', b='0')
         if floating is not None:
@@ -171,7 +170,7 @@ class ImagesManager(object):
         return fname
 
     def serialize(self, images_map):
-        for img in itervalues(self.images):
+        for img in self.images.values():
             images_map['word/' + img.fname] = partial(self.get_data, img.item)
 
     def get_data(self, item):
diff --git a/ebook_converter/ebooks/docx/writer/lists.py b/ebook_converter/ebooks/docx/writer/lists.py
index fa537bd..1c6754c 100644
--- a/ebook_converter/ebooks/docx/writer/lists.py
+++ b/ebook_converter/ebooks/docx/writer/lists.py
@@ -1,8 +1,6 @@
 from collections import defaultdict
 from operator import attrgetter
 
-from ebook_converter.polyglot.builtins import iteritems, itervalues
-
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
@@ -60,7 +58,7 @@ class NumberingDefinition(object):
         items_for_level = defaultdict(list)
         container_for_level = {}
         type_for_level = {}
-        for ilvl, items in iteritems(self.level_map):
+        for ilvl, items in self.level_map.items():
             for container, list_tag, block, list_type, tag_style in items:
                 items_for_level[ilvl].append(list_tag)
                 container_for_level[ilvl] = container
@@ -74,7 +72,7 @@ class NumberingDefinition(object):
         return hash(self.levels)
 
     def link_blocks(self):
-        for ilvl, items in iteritems(self.level_map):
+        for ilvl, items in self.level_map.items():
             for container, list_tag, block, list_type, tag_style in items:
                 block.numbering_id = (self.num_id + 1, ilvl)
 
@@ -146,16 +144,16 @@ class ListsManager(object):
                 ilvl = len(container_tags) - 1
                 l.level_map[ilvl].append((container_tags[0], list_tag, block, list_type, tag_style))
 
-        [nd.finalize() for nd in itervalues(lists)]
+        [nd.finalize() for nd in lists.values()]
         definitions = {}
-        for defn in itervalues(lists):
+        for defn in lists.values():
             try:
                 defn = definitions[defn]
             except KeyError:
                 definitions[defn] = defn
                 defn.num_id = len(definitions) - 1
             defn.link_blocks()
-        self.definitions = sorted(itervalues(definitions), key=attrgetter('num_id'))
+        self.definitions = sorted(definitions.values(), key=attrgetter('num_id'))
 
     def serialize(self, parent):
         for defn in self.definitions:
diff --git a/ebook_converter/ebooks/docx/writer/styles.py b/ebook_converter/ebooks/docx/writer/styles.py
index a814618..d9cacb5 100644
--- a/ebook_converter/ebooks/docx/writer/styles.py
+++ b/ebook_converter/ebooks/docx/writer/styles.py
@@ -7,7 +7,6 @@ from lxml import etree
 from ebook_converter.ebooks import parse_css_length
 from ebook_converter.ebooks.docx.writer.utils import convert_color, int_or_zero
 from ebook_converter.utils.localization import lang_as_iso639_1
-from ebook_converter.polyglot.builtins import iteritems
 from ebook_converter.tinycss.css21 import CSS21Parser
 
 
@@ -155,7 +154,7 @@ class DOCXStyle(object):
             getattr(self, x) for x in self.ALL_PROPS))
 
     def makeelement(self, parent, name, **attrs):
-        return parent.makeelement(self.w(name), **{self.w(k):v for k, v in iteritems(attrs)})
+        return parent.makeelement(self.w(name), **{self.w(k):v for k, v in attrs.items()})
 
     def __hash__(self):
         return self._hash
@@ -362,7 +361,7 @@ class DescendantTextStyle(object):
         p = []
 
         def add(name, **props):
-            p.append((name, frozenset(iteritems(props))))
+            p.append((name, frozenset(props.items())))
 
         def vals(attr):
             return getattr(parent_style, attr), getattr(child_style, attr)
@@ -559,7 +558,7 @@ class BlockStyle(DOCXStyle):
     def serialize_properties(self, pPr, normal_style):
         makeelement, w = self.makeelement, self.w
         spacing = makeelement(pPr, 'spacing')
-        for edge, attr in iteritems({'top':'before', 'bottom':'after'}):
+        for edge, attr in {'top':'before', 'bottom':'after'}.items():
             getter = attrgetter('css_margin_' + edge)
             css_val, css_unit = parse_css_length(getter(self))
             if css_unit in ('em', 'ex'):
@@ -693,7 +692,7 @@ class StylesManager(object):
 
         counts = Counter()
         smap = {}
-        for (bs, rs), blocks in iteritems(used_pairs):
+        for (bs, rs), blocks in used_pairs.items():
             s = CombinedStyle(bs, rs, blocks, self.namespace)
             smap[(bs, rs)] = s
             counts[s] += sum(1 for b in blocks if not b.is_empty())
diff --git a/ebook_converter/ebooks/docx/writer/tables.py b/ebook_converter/ebooks/docx/writer/tables.py
index 03d4ea8..a14a8b6 100644
--- a/ebook_converter/ebooks/docx/writer/tables.py
+++ b/ebook_converter/ebooks/docx/writer/tables.py
@@ -2,7 +2,6 @@ from collections import namedtuple
 
 from ebook_converter.ebooks.docx.writer.utils import convert_color
 from ebook_converter.ebooks.docx.writer.styles import read_css_block_borders as rcbb, border_edges
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -121,7 +120,7 @@ class Cell(object):
             makeelement(tcPr, 'w:shd', w_val="clear", w_color="auto", w_fill=bc)
 
         b = makeelement(tcPr, 'w:tcBorders', append=False)
-        for edge, border in iteritems(self.borders):
+        for edge, border in self.borders.items():
             if border is not None and border.width > 0 and border.style != 'none':
                 makeelement(b, 'w:' + edge, w_val=border.style, w_sz=str(border.width), w_color=border.color)
         if len(b) > 0:
diff --git a/ebook_converter/ebooks/lrf/html/convert_from.py b/ebook_converter/ebooks/lrf/html/convert_from.py
index 88dd065..a3ef870 100644
--- a/ebook_converter/ebooks/lrf/html/convert_from.py
+++ b/ebook_converter/ebooks/lrf/html/convert_from.py
@@ -37,7 +37,6 @@ from ebook_converter.ebooks.lrf.pylrs.pylrs import (
     RuledLine, Span, Sub, Sup, TextBlock
 )
 from ebook_converter.ptempfile import PersistentTemporaryFile
-from ebook_converter.polyglot.builtins import itervalues
 from ebook_converter.polyglot.urllib import unquote
 
 from PIL import Image as PILImage
@@ -1774,7 +1773,7 @@ class HTMLConverter(object):
         self.book.renderLrs(path) if lrs else self.book.renderLrf(path)
 
     def cleanup(self):
-        for _file in chain(itervalues(self.scaled_images), itervalues(self.rotated_images)):
+        for _file in chain(self.scaled_images.values(), self.rotated_images.values()):
             _file.__del__()
 
 
diff --git a/ebook_converter/ebooks/lrf/pylrs/pylrf.py b/ebook_converter/ebooks/lrf/pylrs/pylrf.py
index 7b78ae9..158cd1c 100644
--- a/ebook_converter/ebooks/lrf/pylrs/pylrf.py
+++ b/ebook_converter/ebooks/lrf/pylrs/pylrf.py
@@ -9,7 +9,6 @@ import codecs
 import os
 
 from .pylrfopt import tagListOptimizer
-from ebook_converter.polyglot.builtins import iteritems
 
 PYLRF_VERSION = "1.0"
 
@@ -525,7 +524,7 @@ class LrfObject(object):
         # belongs somewhere, so here it is.
         #
         composites = {}
-        for name, value in iteritems(tagDict):
+        for name, value in tagDict.items():
             if name == 'rubyAlignAndAdjust':
                 continue
             if name in {
diff --git a/ebook_converter/ebooks/lrf/pylrs/pylrs.py b/ebook_converter/ebooks/lrf/pylrs/pylrs.py
index 96c07bd..bcbd057 100644
--- a/ebook_converter/ebooks/lrf/pylrs/pylrs.py
+++ b/ebook_converter/ebooks/lrf/pylrs/pylrs.py
@@ -51,7 +51,7 @@ DEFAULT_GENREADING      = "fs"          # default is yes to both lrf and lrs
 
 from ebook_converter import __appname__, __version__
 from ebook_converter import entity_to_unicode
-from ebook_converter.polyglot.builtins import iteritems, native_string_type
+from ebook_converter.polyglot.builtins import native_string_type
 
 
 class LrsError(Exception):
@@ -1835,7 +1835,7 @@ class Span(LrsSimpleChar1, LrsContainer):
         oldTextStyle = self.findCurrentTextStyle()
 
         # set the attributes we want changed
-        for (name, value) in tuple(iteritems(self.attrs)):
+        for name, value in tuple(self.attrs.items()):
             if name in oldTextStyle.attrs and oldTextStyle.attrs[name] == self.attrs[name]:
                 self.attrs.pop(name)
             else:
diff --git a/ebook_converter/ebooks/metadata/__init__.py b/ebook_converter/ebooks/metadata/__init__.py
index 29caad0..3e8c7f4 100644
--- a/ebook_converter/ebooks/metadata/__init__.py
+++ b/ebook_converter/ebooks/metadata/__init__.py
@@ -9,7 +9,7 @@ import urllib.parse
 
 from ebook_converter import relpath, guess_type, prints, force_unicode
 from ebook_converter.utils.config_base import tweaks
-from ebook_converter.polyglot.builtins import iteritems, itervalues, as_unicode
+from ebook_converter.polyglot.builtins import as_unicode
 from ebook_converter.polyglot.urllib import unquote
 
 
@@ -49,7 +49,7 @@ def remove_bracketed_text(src, brackets=None):
     counts = Counter()
     buf = []
     src = force_unicode(src)
-    rmap = {v: k for k, v in iteritems(brackets)}
+    rmap = {v: k for k, v in brackets.items()}
     for char in src:
         if char in brackets:
             counts[char] += 1
@@ -57,7 +57,7 @@ def remove_bracketed_text(src, brackets=None):
             idx = rmap[char]
             if counts[idx] > 0:
                 counts[idx] -= 1
-        elif sum(itervalues(counts)) < 1:
+        elif sum(counts.values()) < 1:
             buf.append(char)
     return ''.join(buf)
 
diff --git a/ebook_converter/ebooks/metadata/book/base.py b/ebook_converter/ebooks/metadata/book/base.py
index 2a7acaf..784a763 100644
--- a/ebook_converter/ebooks/metadata/book/base.py
+++ b/ebook_converter/ebooks/metadata/book/base.py
@@ -7,7 +7,6 @@ from ebook_converter.ebooks.metadata.book import (SC_COPYABLE_FIELDS,
         TOP_LEVEL_IDENTIFIERS, ALL_METADATA_FIELDS)
 from ebook_converter.library.field_metadata import FieldMetadata
 from ebook_converter.utils.icu import sort_key
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -253,7 +252,7 @@ class Metadata(object):
         Set all identifiers. Note that if you previously set ISBN, calling
         this method will delete it.
         '''
-        cleaned = {ck(k):cv(v) for k, v in iteritems(identifiers) if k and v}
+        cleaned = {ck(k):cv(v) for k, v in identifiers.items() if k and v}
         object.__getattribute__(self, '_data')['identifiers'] = cleaned
 
     def set_identifier(self, typ, val):
@@ -394,7 +393,7 @@ class Metadata(object):
             return
 
         um = {}
-        for key, meta in iteritems(metadata):
+        for key, meta in metadata.items():
             m = meta.copy()
             if '#value#' not in m:
                 if m['datatype'] == 'text' and m['is_multiple']:
@@ -574,7 +573,7 @@ class Metadata(object):
             if callable(getattr(other, 'get_identifiers', None)):
                 d = self.get_identifiers()
                 s = other.get_identifiers()
-                d.update([v for v in iteritems(s) if v[1] is not None])
+                d.update([v for v in s.items() if v[1] is not None])
                 self.set_identifiers(d)
             else:
                 # other structure not Metadata. Copy the top-level identifiers
@@ -748,7 +747,7 @@ class Metadata(object):
             fmt('Rights', str(self.rights))
         if self.identifiers:
             fmt('Identifiers', ', '.join(['%s:%s'%(k, v) for k, v in
-                iteritems(self.identifiers)]))
+                self.identifiers.items()]))
         if self.comments:
             fmt('Comments', self.comments)
 
diff --git a/ebook_converter/ebooks/metadata/book/json_codec.py b/ebook_converter/ebooks/metadata/book/json_codec.py
index fe4ed13..c9d243c 100644
--- a/ebook_converter/ebooks/metadata/book/json_codec.py
+++ b/ebook_converter/ebooks/metadata/book/json_codec.py
@@ -10,7 +10,7 @@ from ebook_converter.ebooks.metadata.book import SERIALIZABLE_FIELDS
 from ebook_converter.constants import filesystem_encoding, preferred_encoding
 from ebook_converter.library.field_metadata import FieldMetadata
 from ebook_converter import isbytestring
-from ebook_converter.polyglot.builtins import iteritems, itervalues, as_bytes
+from ebook_converter.polyglot.builtins import as_bytes
 from ebook_converter.polyglot.binary import as_base64_unicode, from_base64_bytes
 
 
@@ -151,7 +151,7 @@ class JsonCodec(object):
     def encode_metadata_attr(self, book, key):
         if key == 'user_metadata':
             meta = book.get_all_user_metadata(make_copy=True)
-            for fm in itervalues(meta):
+            for fm in meta.values():
                 if fm['datatype'] == 'datetime':
                     fm['#value#'] = datetime_to_string(fm['#value#'])
                 encode_is_multiple(fm)
@@ -186,7 +186,7 @@ class JsonCodec(object):
     def raw_to_book(self, json_book, book_class, prefix):
         try:
             book = book_class(prefix, json_book.get('lpath', None))
-            for key,val in iteritems(json_book):
+            for key,val in json_book.items():
                 meta = self.decode_metadata(key, val)
                 if key == 'user_metadata':
                     book.set_all_user_metadata(meta)
@@ -203,7 +203,7 @@ class JsonCodec(object):
         if key == 'classifiers':
             key = 'identifiers'
         if key == 'user_metadata':
-            for fm in itervalues(value):
+            for fm in value.values():
                 if fm['datatype'] == 'datetime':
                     fm['#value#'] = string_to_datetime(fm['#value#'])
                 decode_is_multiple(fm)
diff --git a/ebook_converter/ebooks/metadata/html.py b/ebook_converter/ebooks/metadata/html.py
index 0338c58..2761509 100644
--- a/ebook_converter/ebooks/metadata/html.py
+++ b/ebook_converter/ebooks/metadata/html.py
@@ -13,7 +13,6 @@ from ebook_converter.ebooks.metadata.book.base import Metadata
 from ebook_converter.ebooks.chardet import xml_to_unicode
 from ebook_converter import replace_entities, isbytestring
 from ebook_converter.utils.date import parse_date, is_date_undefined
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -54,8 +53,8 @@ META_NAMES = {
     'comments': ('comments', 'dc.description'),
     'tags': ('tags',),
 }
-rmap_comment = {v:k for k, v in iteritems(COMMENT_NAMES)}
-rmap_meta = {v:k for k, l in iteritems(META_NAMES) for v in l}
+rmap_comment = {v:k for k, v in COMMENT_NAMES.items()}
+rmap_meta = {v:k for k, l in META_NAMES.items() for v in l}
 
 
 # Extract an HTML attribute value, supports both single and double quotes and
@@ -230,7 +229,7 @@ def get_metadata_(src, encoding=None):
             mi.tags = tags
 
     # IDENTIFIERS
-    for (k,v) in iteritems(meta_tag_ids):
+    for (k,v) in meta_tag_ids.items():
         v = [x.strip() for x in v if x.strip()]
         if v:
             mi.set_identifier(k, v[0])
diff --git a/ebook_converter/ebooks/metadata/opf2.py b/ebook_converter/ebooks/metadata/opf2.py
index 56fc82a..19f8a3c 100644
--- a/ebook_converter/ebooks/metadata/opf2.py
+++ b/ebook_converter/ebooks/metadata/opf2.py
@@ -27,7 +27,6 @@ from ebook_converter import prints, guess_type
 from ebook_converter.utils.cleantext import clean_ascii_chars, clean_xml_chars
 from ebook_converter.utils.config import tweaks
 from ebook_converter.utils.xml_parse import safe_xml_fromstring
-from ebook_converter.polyglot.builtins import iteritems
 from ebook_converter.polyglot.urllib import unquote
 
 
@@ -970,7 +969,7 @@ class OPF(object):  # {{{
             'descendant::*[local-name() = "identifier" and text()]')(
                     self.metadata):
             found_scheme = False
-            for attr, val in iteritems(x.attrib):
+            for attr, val in x.attrib.items():
                 if attr.endswith('scheme'):
                     typ = val.lower()
                     val = etree.tostring(x, with_tail=False, encoding='unicode',
@@ -1003,7 +1002,7 @@ class OPF(object):  # {{{
                     self.metadata):
             xid = x.get('id', None)
             is_package_identifier = uuid_id is not None and uuid_id == xid
-            typ = {val.lower() for attr, val in iteritems(x.attrib) if attr.endswith('scheme')}
+            typ = {val.lower() for attr, val in x.attrib.items() if attr.endswith('scheme')}
             if is_package_identifier:
                 typ = tuple(typ)
                 if typ and typ[0] in identifiers:
@@ -1012,7 +1011,7 @@ class OPF(object):  # {{{
             if typ and not (typ & {'calibre', 'uuid'}):
                 x.getparent().remove(x)
 
-        for typ, val in iteritems(identifiers):
+        for typ, val in identifiers.items():
             attrib = {'{%s}scheme'%self.NAMESPACES['opf']: typ.upper()}
             self.set_text(self.create_metadata_element(
                 'identifier', attrib=attrib), str(val))
@@ -1134,7 +1133,7 @@ class OPF(object):  # {{{
     def page_progression_direction(self):
         spine = self.XPath('descendant::*[re:match(name(), "spine", "i")][1]')(self.root)
         if spine:
-            for k, v in iteritems(spine[0].attrib):
+            for k, v in spine[0].attrib.items():
                 if k == 'page-progression-direction' or k.endswith('}page-progression-direction'):
                     return v
 
@@ -1501,7 +1500,7 @@ class OPFCreator(Metadata):
             a(DC_ELEM('description', self.comments))
         if self.publisher:
             a(DC_ELEM('publisher', self.publisher))
-        for key, val in iteritems(self.get_identifiers()):
+        for key, val in self.get_identifiers().items():
             a(DC_ELEM('identifier', val, opf_attrs={'scheme':key.upper()}))
         if self.rights:
             a(DC_ELEM('rights', self.rights))
@@ -1627,7 +1626,7 @@ def metadata_to_opf(mi, as_string=True, default_lang=None):
         try:
             elem = metadata.makeelement(tag, attrib=attrib)
         except ValueError:
-            elem = metadata.makeelement(tag, attrib={k:clean_xml_chars(v) for k, v in iteritems(attrib)})
+            elem = metadata.makeelement(tag, attrib={k:clean_xml_chars(v) for k, v in attrib.items()})
         elem.tail = '\n'+(' '*8)
         if text:
             try:
@@ -1648,7 +1647,7 @@ def metadata_to_opf(mi, as_string=True, default_lang=None):
         factory(DC('description'), clean_ascii_chars(mi.comments))
     if mi.publisher:
         factory(DC('publisher'), mi.publisher)
-    for key, val in iteritems(mi.get_identifiers()):
+    for key, val in mi.get_identifiers().items():
         factory(DC('identifier'), val, scheme=key.upper())
     if mi.rights:
         factory(DC('rights'), mi.rights)
diff --git a/ebook_converter/ebooks/metadata/opf3.py b/ebook_converter/ebooks/metadata/opf3.py
index 6a03967..173f957 100644
--- a/ebook_converter/ebooks/metadata/opf3.py
+++ b/ebook_converter/ebooks/metadata/opf3.py
@@ -2,7 +2,6 @@ import json
 import re
 from collections import defaultdict, namedtuple
 from functools import wraps
-from ebook_converter.polyglot.builtins import iteritems
 
 from lxml import etree
 
@@ -185,9 +184,9 @@ def ensure_prefix(root, prefixes, prefix, value=None):
     if prefixes is None:
         prefixes = read_prefixes(root)
     prefixes[prefix] = value or reserved_prefixes[prefix]
-    prefixes = {k:v for k, v in iteritems(prefixes) if reserved_prefixes.get(k) != v}
+    prefixes = {k:v for k, v in prefixes.items() if reserved_prefixes.get(k) != v}
     if prefixes:
-        root.set('prefix', ' '.join('%s: %s' % (k, v) for k, v in iteritems(prefixes)))
+        root.set('prefix', ' '.join('%s: %s' % (k, v) for k, v in prefixes.items()))
     else:
         root.attrib.pop('prefix', None)
 
@@ -294,7 +293,7 @@ def set_identifiers(root, prefixes, refines, new_identifiers, force_identifiers=
             remove_element(ident, refines)
             continue
     metadata = XPath('./opf:metadata')(root)[0]
-    for scheme, val in iteritems(new_identifiers):
+    for scheme, val in new_identifiers.items():
         ident = metadata.makeelement(DC('identifier'))
         ident.text = '%s:%s' % (scheme, val)
         if package_identifier is None:
@@ -850,7 +849,7 @@ set_author_link_map = dict_writer('author_link_map')
 def deserialize_user_metadata(val):
     val = json.loads(val, object_hook=from_json)
     ans = {}
-    for name, fm in iteritems(val):
+    for name, fm in val.items():
         decode_is_multiple(fm)
         ans[name] = fm
     return ans
@@ -965,7 +964,7 @@ def read_metadata(root, ver=None, return_extra_data=False):
     prefixes, refines = read_prefixes(root), read_refines(root)
     identifiers = read_identifiers(root, prefixes, refines)
     ids = {}
-    for key, vals in iteritems(identifiers):
+    for key, vals in identifiers.items():
         if key == 'calibre':
             ans.application_id = vals[0]
         elif key == 'uuid':
@@ -1003,7 +1002,7 @@ def read_metadata(root, ver=None, return_extra_data=False):
         ans.series, ans.series_index = s, si
     ans.author_link_map = read_author_link_map(root, prefixes, refines) or ans.author_link_map
     ans.user_categories = read_user_categories(root, prefixes, refines) or ans.user_categories
-    for name, fm in iteritems((read_user_metadata(root, prefixes, refines) or {})):
+    for name, fm in (read_user_metadata(root, prefixes, refines) or {}).items():
         ans.set_user_metadata(name, fm)
     if return_extra_data:
         ans = ans, ver, read_raster_cover(root, prefixes, refines), first_spine_item(root, prefixes, refines)
diff --git a/ebook_converter/ebooks/metadata/pdf.py b/ebook_converter/ebooks/metadata/pdf.py
index 3da39d4..20431a3 100644
--- a/ebook_converter/ebooks/metadata/pdf.py
+++ b/ebook_converter/ebooks/metadata/pdf.py
@@ -10,7 +10,6 @@ from ebook_converter.ptempfile import TemporaryDirectory
 from ebook_converter.ebooks.metadata import (
     MetaInformation, string_to_authors, check_isbn, check_doi)
 from ebook_converter.utils.ipc.simple_worker import fork_job, WorkerError
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -157,9 +156,9 @@ def get_metadata(stream, cover=True):
 
     # Look for recognizable identifiers in the info dict, if they were not
     # found in the XMP metadata
-    for scheme, check_func in iteritems({'doi':check_doi, 'isbn':check_isbn}):
+    for scheme, check_func in {'doi':check_doi, 'isbn':check_isbn}.items():
         if scheme not in mi.get_identifiers():
-            for k, v in iteritems(info):
+            for k, v in info.items():
                 if k != 'xmp_metadata':
                     val = check_func(v)
                     if val:
diff --git a/ebook_converter/ebooks/metadata/xmp.py b/ebook_converter/ebooks/metadata/xmp.py
index 62226be..2516566 100644
--- a/ebook_converter/ebooks/metadata/xmp.py
+++ b/ebook_converter/ebooks/metadata/xmp.py
@@ -12,7 +12,6 @@ from ebook_converter.ebooks.metadata.book.base import Metadata
 from ebook_converter.ebooks.metadata.opf2 import dump_dict
 from ebook_converter.utils.date import parse_date, isoformat, now
 from ebook_converter.utils.localization import canonicalize_lang, lang_as_iso639_1
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -320,7 +319,7 @@ def metadata_from_xmp_packet(raw_bytes):
                     identifiers[scheme] = val
 
     # Check Dublin Core for recognizable identifier types
-    for scheme, check_func in iteritems({'doi':check_doi, 'isbn':check_isbn}):
+    for scheme, check_func in {'doi':check_doi, 'isbn':check_isbn}.items():
         if scheme not in identifiers:
             val = check_func(first_simple('//dc:identifier', root))
             if val:
@@ -404,7 +403,7 @@ def create_identifiers(xmp, identifiers):
     xmp.append(xmpid)
     bag = xmpid.makeelement(expand('rdf:Bag'))
     xmpid.append(bag)
-    for scheme, value in iteritems(identifiers):
+    for scheme, value in identifiers.items():
         li = bag.makeelement(expand('rdf:li'))
         li.set(expand('rdf:parseType'), 'Resource')
         bag.append(li)
@@ -440,7 +439,7 @@ def create_user_metadata(calibre, all_user_metadata):
     calibre.append(s)
     bag = s.makeelement(expand('rdf:Bag'))
     s.append(bag)
-    for name, fm in iteritems(all_user_metadata):
+    for name, fm in all_user_metadata.items():
         try:
             fm = copy.copy(fm)
             encode_is_multiple(fm)
@@ -470,12 +469,12 @@ def metadata_to_xmp_packet(mi):
     dc = rdf.makeelement(expand('rdf:Description'), nsmap=nsmap('dc'))
     dc.set(expand('rdf:about'), '')
     rdf.append(dc)
-    for prop, tag in iteritems({'title':'dc:title', 'comments':'dc:description'}):
+    for prop, tag in {'title':'dc:title', 'comments':'dc:description'}.items():
         val = mi.get(prop) or ''
         create_alt_property(dc, tag, val)
-    for prop, (tag, ordered) in iteritems({
-        'authors':('dc:creator', True), 'tags':('dc:subject', False), 'publisher':('dc:publisher', False),
-    }):
+    for prop, (tag, ordered) in {'authors': ('dc:creator', True),
+                                 'tags': ('dc:subject', False),
+                                 'publisher': ('dc:publisher', False)}.items():
         val = mi.get(prop) or ()
         if isinstance(val, (str, bytes)):
             val = [val]
@@ -499,9 +498,9 @@ def metadata_to_xmp_packet(mi):
     identifiers = mi.get_identifiers()
     if identifiers:
         create_identifiers(xmp, identifiers)
-        for scheme, val in iteritems(identifiers):
+        for scheme, val in identifiers.items():
             if scheme in {'isbn', 'doi'}:
-                for prefix, parent in iteritems(extra_ids):
+                for prefix, parent in extra_ids.items():
                     ie = parent.makeelement(expand('%s:%s'%(prefix, scheme)))
                     ie.text = val
                     parent.append(ie)
@@ -549,7 +548,7 @@ def find_used_namespaces(elem):
 
 def find_preferred_prefix(namespace, elems):
     for elem in elems:
-        ans = {v:k for k, v in iteritems(elem.nsmap)}.get(namespace, None)
+        ans = {v:k for k, v in elem.nsmap.items()}.get(namespace, None)
         if ans is not None:
             return ans
         return find_preferred_prefix(namespace, elem.iterchildren(etree.Element))
@@ -561,7 +560,7 @@ def find_nsmap(elems):
         used_namespaces |= find_used_namespaces(elem)
     ans = {}
     used_namespaces -= {NS_MAP['xml'], NS_MAP['x'], None, NS_MAP['rdf']}
-    rmap = {v:k for k, v in iteritems(NS_MAP)}
+    rmap = {v:k for k, v in NS_MAP.items()}
     i = 0
     for ns in used_namespaces:
         if ns in rmap:
diff --git a/ebook_converter/ebooks/mobi/reader/index.py b/ebook_converter/ebooks/mobi/reader/index.py
index d9b70f4..72d6e67 100644
--- a/ebook_converter/ebooks/mobi/reader/index.py
+++ b/ebook_converter/ebooks/mobi/reader/index.py
@@ -3,7 +3,6 @@ from collections import OrderedDict, namedtuple
 
 from ebook_converter.ebooks.mobi.utils import (decint, count_set_bits,
         decode_string)
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -119,10 +118,10 @@ class CNCX(object):  # {{{
     __nonzero__ = __bool__
 
     def iteritems(self):
-        return iteritems(self.records)
+        return self.records.items()
 
     def items(self):
-        return iteritems(self.records)
+        return self.records.items()
 # }}}
 
 
diff --git a/ebook_converter/ebooks/mobi/reader/mobi6.py b/ebook_converter/ebooks/mobi/reader/mobi6.py
index 8f06516..18e10d3 100644
--- a/ebook_converter/ebooks/mobi/reader/mobi6.py
+++ b/ebook_converter/ebooks/mobi/reader/mobi6.py
@@ -16,7 +16,6 @@ from ebook_converter.ebooks.metadata.toc import TOC
 from ebook_converter.ebooks.mobi.reader.headers import BookHeader
 from ebook_converter.utils.img import save_cover_data_to, gif_data_to_png_data, AnimatedGIF
 from ebook_converter.utils.imghdr import what
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -918,18 +917,16 @@ class MobiReader(object):
 
 
 def test_mbp_regex():
-    for raw, m in iteritems({
-        '<mbp:pagebreak></mbp:pagebreak>':'',
-        '<mbp:pagebreak xxx></mbp:pagebreak>yyy':' xxxyyy',
-        '<mbp:pagebreak> </mbp:pagebreak>':'',
-        '<mbp:pagebreak>xxx':'xxx',
-        '<mbp:pagebreak/>xxx':'xxx',
-        '<mbp:pagebreak sdf/ >xxx':' sdfxxx',
-        '<mbp:pagebreak / >':' ',
-        '</mbp:pagebreak>':'',
-        '</mbp:pagebreak sdf>':' sdf',
-        '</mbp:pagebreak><mbp:pagebreak></mbp:pagebreak>xxx':'xxx',
-        }):
+    for raw, m in {'<mbp:pagebreak></mbp:pagebreak>':'',
+                   '<mbp:pagebreak xxx></mbp:pagebreak>yyy':' xxxyyy',
+                   '<mbp:pagebreak> </mbp:pagebreak>':'',
+                   '<mbp:pagebreak>xxx':'xxx',
+                   '<mbp:pagebreak/>xxx':'xxx',
+                   '<mbp:pagebreak sdf/ >xxx':' sdfxxx',
+                   '<mbp:pagebreak / >':' ',
+                   '</mbp:pagebreak>':'',
+                   '</mbp:pagebreak sdf>':' sdf',
+                   '</mbp:pagebreak><mbp:pagebreak></mbp:pagebreak>xxx':'xxx'}.items():
         ans = MobiReader.PAGE_BREAK_PAT.sub(r'\1', raw)
         if ans != m:
             raise Exception('%r != %r for %r'%(ans, m, raw))
diff --git a/ebook_converter/ebooks/mobi/reader/ncx.py b/ebook_converter/ebooks/mobi/reader/ncx.py
index 2130adf..bd0b0d7 100644
--- a/ebook_converter/ebooks/mobi/reader/ncx.py
+++ b/ebook_converter/ebooks/mobi/reader/ncx.py
@@ -4,7 +4,6 @@ from ebook_converter import replace_entities
 from ebook_converter.ebooks.metadata.toc import TOC
 from ebook_converter.ebooks.mobi.reader.headers import NULL_INDEX
 from ebook_converter.ebooks.mobi.reader.index import read_index
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -53,8 +52,7 @@ def read_ncx(sections, index, codec):
     if index != NULL_INDEX:
         table, cncx = read_index(sections, index, codec)
 
-        for num, x in enumerate(iteritems(table)):
-            text, tag_map = x
+        for num, (text, tag_map) in enumerate(table.items()):
             entry = default_entry.copy()
             entry['name'] = text
             entry['num'] = num
@@ -68,9 +66,9 @@ def read_ncx(sections, index, codec):
                         # offset
                         fieldvalue = tuple(tag_map[tag])
                     entry[fieldname] = fieldvalue
-                    for which, name in iteritems({3:'text', 5:'kind', 70:'description',
-                            71:'author', 72:'image_caption',
-                            73:'image_attribution'}):
+                    for which, name in {3:'text', 5:'kind', 70:'description',
+                                        71:'author', 72:'image_caption',
+                                        73:'image_attribution'}.items():
                         if tag == which:
                             entry[name] = cncx.get(fieldvalue,
                                     default_entry[name])
diff --git a/ebook_converter/ebooks/mobi/writer2/indexer.py b/ebook_converter/ebooks/mobi/writer2/indexer.py
index 8550045..6ee4f29 100644
--- a/ebook_converter/ebooks/mobi/writer2/indexer.py
+++ b/ebook_converter/ebooks/mobi/writer2/indexer.py
@@ -5,7 +5,6 @@ from collections import OrderedDict, defaultdict
 
 from ebook_converter.ebooks.mobi.utils import (encint, encode_number_as_hex,
         encode_tbs, align_block, RECORD_SIZE, CNCX as CNCX_)
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -104,7 +103,7 @@ class IndexEntry(object):
             'author_offset': 71,
 
     }
-    RTAG_MAP = {v:k for k, v in iteritems(TAG_VALUES)}  # noqa
+    RTAG_MAP = {v:k for k, v in TAG_VALUES.items()}  # noqa
 
     def __init__(self, offset, label_offset):
         self.offset, self.label_offset = offset, label_offset
@@ -220,8 +219,8 @@ class SecondaryIndexEntry(IndexEntry):
 
         # The values for this index entry
         # I dont know what the 5 means, it is not the number of entries
-        self.secondary = [5 if tag == min(
-            itervalues(self.INDEX_MAP)) else 0, 0, tag]
+        self.secondary = [5 if tag == min(self.INDEX_MAP.values())
+                          else 0, 0, tag]
 
     @property
     def tag_nums(self):
@@ -233,7 +232,7 @@ class SecondaryIndexEntry(IndexEntry):
 
     @classmethod
     def entries(cls):
-        rmap = {v:k for k,v in iteritems(cls.INDEX_MAP)}
+        rmap = {v:k for k,v in cls.INDEX_MAP.items()}
         for tag in sorted(rmap, reverse=True):
             yield cls(rmap[tag])
 
@@ -278,7 +277,7 @@ class TBS(object):  # {{{
                 for x in ('starts', 'ends', 'completes'):
                     for idx in data[x]:
                         depth_map[idx.depth].append(idx)
-                for l in itervalues(depth_map):
+                for l in depth_map.values():
                     l.sort(key=lambda x:x.offset)
                 self.periodical_tbs(data, first, depth_map)
         else:
diff --git a/ebook_converter/ebooks/mobi/writer2/main.py b/ebook_converter/ebooks/mobi/writer2/main.py
index ac10f83..dee43e3 100644
--- a/ebook_converter/ebooks/mobi/writer2/main.py
+++ b/ebook_converter/ebooks/mobi/writer2/main.py
@@ -10,7 +10,6 @@ from ebook_converter.ebooks.mobi.writer2 import (PALMDOC, UNCOMPRESSED)
 from ebook_converter.ebooks.mobi.utils import (encint, encode_trailing_data,
         align_block, detect_periodical, RECORD_SIZE, create_text_record)
 from ebook_converter.ebooks.mobi.writer2.indexer import Indexer
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -421,10 +420,9 @@ class MobiWriter(object):
             extra_data_flags |= 0b10
         header_fields['extra_data_flags'] = extra_data_flags
 
-        for k, v in iteritems({'last_text_record':'last_text_record_idx',
-                'first_non_text_record':'first_non_text_record_idx',
-                'ncx_index':'primary_index_record_idx',
-                }):
+        for k, v in {'last_text_record':'last_text_record_idx',
+                     'first_non_text_record':'first_non_text_record_idx',
+                     'ncx_index':'primary_index_record_idx'}.items():
             header_fields[k] = getattr(self, v)
         if header_fields['ncx_index'] is None:
             header_fields['ncx_index'] = NULL_INDEX
diff --git a/ebook_converter/ebooks/mobi/writer2/resources.py b/ebook_converter/ebooks/mobi/writer2/resources.py
index 7608ca8..7204ba4 100644
--- a/ebook_converter/ebooks/mobi/writer2/resources.py
+++ b/ebook_converter/ebooks/mobi/writer2/resources.py
@@ -8,7 +8,6 @@ from ebook_converter.ebooks import generate_masthead
 from ebook_converter.ebooks.oeb.base import OEB_RASTER_IMAGES
 from ebook_converter.ptempfile import PersistentTemporaryFile
 from ebook_converter.utils.imghdr import what
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -155,7 +154,7 @@ class Resources(object):
 
     def serialize(self, records, used_images):
         used_image_indices = self.used_image_indices | {
-                v-1 for k, v in iteritems(self.item_map) if k in used_images}
+                v-1 for k, v in self.item_map.items() if k in used_images}
         for i in self.image_indices-used_image_indices:
             self.records[i] = PLACEHOLDER_GIF
         records.extend(self.records)
diff --git a/ebook_converter/ebooks/mobi/writer8/exth.py b/ebook_converter/ebooks/mobi/writer8/exth.py
index 1ae2e28..ef91fa1 100644
--- a/ebook_converter/ebooks/mobi/writer8/exth.py
+++ b/ebook_converter/ebooks/mobi/writer8/exth.py
@@ -6,7 +6,6 @@ from ebook_converter.constants import iswindows, isosx
 from ebook_converter.ebooks.mobi.utils import (utf8_text, to_base)
 from ebook_converter.utils.localization import lang_as_iso639_1
 from ebook_converter.ebooks.metadata import authors_to_sort_string
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -159,7 +158,7 @@ def build_exth(metadata, prefer_author_sort=False, is_periodical=False,
     else:
         # Pretend to be kindlegen 1.2
         vals = {204:201, 205:1, 206:2, 207:33307}
-    for code, val in iteritems(vals):
+    for code, val in vals.items():
         exth.write(pack(b'>III', code, 12, val))
         nrecs += 1
     if be_kindlegen2:
diff --git a/ebook_converter/ebooks/oeb/base.py b/ebook_converter/ebooks/oeb/base.py
index af2d724..824b6fb 100644
--- a/ebook_converter/ebooks/oeb/base.py
+++ b/ebook_converter/ebooks/oeb/base.py
@@ -17,7 +17,6 @@ from ebook_converter import (isbytestring, as_unicode, get_types_map)
 from ebook_converter.ebooks.oeb.parse_utils import barename, XHTML_NS, namespace, XHTML, parse_html, NotHTML
 from ebook_converter.utils.cleantext import clean_xml_chars
 from ebook_converter.utils.short_uuid import uuid4
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 from ebook_converter.polyglot.urllib import unquote as urlunquote
 
 
@@ -700,7 +699,7 @@ class Metadata(object):
                 term = CALIBRE(local)
             self.term = term
             self.value = value
-            for attr, value in tuple(iteritems(attrib)):
+            for attr, value in tuple(attrib.items()):
                 if isprefixname(value):
                     attrib[attr] = qname(value, nsmap)
                 nsattr = Metadata.OPF_ATTRS.get(attr, attr)
@@ -857,7 +856,7 @@ class Metadata(object):
 
     def to_opf1(self, parent=None):
         nsmap = self._opf1_nsmap
-        nsrmap = {value: key for key, value in iteritems(nsmap)}
+        nsrmap = {value: key for key, value in nsmap.items()}
         elem = element(parent, 'metadata', nsmap=nsmap)
         dcmeta = element(elem, 'dc-metadata', nsmap=OPF1_NSMAP)
         xmeta = element(elem, 'x-metadata')
@@ -871,7 +870,7 @@ class Metadata(object):
 
     def to_opf2(self, parent=None):
         nsmap = self._opf2_nsmap
-        nsrmap = {value: key for key, value in iteritems(nsmap)}
+        nsrmap = {value: key for key, value in nsmap.items()}
         elem = element(parent, OPF('metadata'), nsmap=nsmap)
         for term in self.items:
             for item in self.items[term]:
@@ -1424,7 +1423,7 @@ class Guide(object):
         @property
         def item(self):
             """The manifest item associated with this reference."""
-            path = uurllib.parse.rldefrag(self.href)[0]
+            path = urllib.parse.urldefrag(self.href)[0]
             hrefs = self.oeb.manifest.hrefs
             return hrefs.get(path, None)
 
@@ -1444,7 +1443,7 @@ class Guide(object):
         return self.refs.pop(type, None)
 
     def remove_by_href(self, href):
-        remove = [r for r, i in iteritems(self.refs) if i.href == href]
+        remove = [r for r, i in self.refs.items() if i.href == href]
         for r in remove:
             self.remove(r)
 
@@ -1454,7 +1453,7 @@ class Guide(object):
     __iter__ = iterkeys
 
     def values(self):
-        return sorted(itervalues(self.refs), key=lambda ref: ref.ORDER.get(ref.type, 10000))
+        return sorted(self.refs.values(), key=lambda ref: ref.ORDER.get(ref.type, 10000))
 
     def items(self):
         for type, ref in self.refs.items():
diff --git a/ebook_converter/ebooks/oeb/normalize_css.py b/ebook_converter/ebooks/oeb/normalize_css.py
index 2400166..8e98ddc 100644
--- a/ebook_converter/ebooks/oeb/normalize_css.py
+++ b/ebook_converter/ebooks/oeb/normalize_css.py
@@ -5,7 +5,6 @@ from css_parser.css import PropertyValue
 from css_parser import profile as cssprofiles, CSSParser
 from ebook_converter.tinycss.fonts3 import parse_font, serialize_font_family
 from ebook_converter.ebooks.oeb.base import css_text
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -137,7 +136,7 @@ def normalize_border(name, cssvalue):
     style = normalizers['border-' + EDGES[0]]('border-' + EDGES[0], cssvalue)
     vals = style.copy()
     for edge in EDGES[1:]:
-        style.update({k.replace(EDGES[0], edge):v for k, v in iteritems(vals)})
+        style.update({k.replace(EDGES[0], edge):v for k, v in vals.items()})
     return style
 
 
@@ -251,7 +250,7 @@ def condense_rule(style):
             if prop.name and prop.name.startswith(x):
                 expanded[x].append(prop)
                 break
-    for prefix, vals in iteritems(expanded):
+    for prefix, vals in expanded.items():
         if len(vals) > 1 and {x.priority for x in vals} == {''}:
             condensers[prefix[:-1]](style, vals)
 
@@ -277,18 +276,35 @@ def test_normalization(return_tests=False):  # {{{
                 ans.update(expected)
                 return ans
 
-            for raw, expected in iteritems({
-                'some_font': {'font-family':'some_font'}, 'inherit':{k:'inherit' for k in font_composition},
-                '1.2pt/1.4 A_Font': {'font-family':'A_Font', 'font-size':'1.2pt', 'line-height':'1.4'},
-                'bad font': {'font-family':'"bad font"'}, '10% serif': {'font-family':'serif', 'font-size':'10%'},
-                '12px "My Font", serif': {'font-family':'"My Font", serif', 'font-size': '12px'},
-                'normal 0.6em/135% arial,sans-serif': {'font-family': 'arial, sans-serif', 'font-size': '0.6em', 'line-height':'135%', 'font-style':'normal'},
-                'bold italic large serif': {'font-family':'serif', 'font-weight':'bold', 'font-style':'italic', 'font-size':'large'},
-                'bold italic small-caps larger/normal serif':
-                {'font-family':'serif', 'font-weight':'bold', 'font-style':'italic', 'font-size':'larger',
-                 'line-height':'normal', 'font-variant':'small-caps'},
-                '2em A B': {'font-family': '"A B"', 'font-size': '2em'},
-            }):
+            for raw, expected in {'some_font': {'font-family':'some_font'},
+                                  'inherit':{k:'inherit' for k in font_composition},
+                                  '1.2pt/1.4 A_Font': {'font-family':'A_Font',
+                                                       'font-size':'1.2pt',
+                                                       'line-height':'1.4'},
+                                  'bad font': {'font-family':'"bad font"'},
+                                  '10% serif': {'font-family':'serif',
+                                                'font-size':'10%'},
+                                  '12px "My Font", serif':
+                                  {'font-family':'"My Font", serif',
+                                   'font-size': '12px'},
+                                  'normal 0.6em/135% arial,sans-serif':
+                                  {'font-family': 'arial, sans-serif',
+                                   'font-size': '0.6em',
+                                   'line-height':'135%',
+                                   'font-style':'normal'},
+                                  'bold italic large serif': {'font-family':'serif',
+                                                              'font-weight':'bold',
+                                                              'font-style':'italic',
+                                                              'font-size':'large'},
+                                  'bold italic small-caps larger/normal serif':
+                                  {'font-family':'serif',
+                                   'font-weight':'bold',
+                                   'font-style':'italic',
+                                   'font-size':'larger',
+                                   'line-height':'normal',
+                                   'font-variant':'small-caps'},
+                                  '2em A B': {'font-family': '"A B"',
+                                              'font-size': '2em'}}.items():
                 val = tuple(parseStyle('font: %s' % raw, validate=False))[0].cssValue
                 style = normalizers['font']('font', val)
                 self.assertDictEqual(font_dict(expected), style, raw)
@@ -296,7 +312,7 @@ def test_normalization(return_tests=False):  # {{{
         def test_border_normalization(self):
             def border_edge_dict(expected, edge='right'):
                 ans = {'border-%s-%s' % (edge, x): DEFAULTS['border-%s-%s' % (edge, x)] for x in ('style', 'width', 'color')}
-                for x, v in iteritems(expected):
+                for x, v in expected.items():
                     ans['border-%s-%s' % (edge, x)] = v
                 return ans
 
@@ -312,39 +328,41 @@ def test_normalization(return_tests=False):  # {{{
                     ans['border-%s-%s' % (edge, val)] = expected
                 return ans
 
-            for raw, expected in iteritems({
-                'solid 1px red': {'color':'red', 'width':'1px', 'style':'solid'},
-                '1px': {'width': '1px'}, '#aaa': {'color': '#aaa'},
-                '2em groove': {'width':'2em', 'style':'groove'},
-            }):
+            for raw, expected in {'solid 1px red': {'color':'red',
+                                                    'width':'1px',
+                                                    'style':'solid'},
+                                  '1px': {'width': '1px'},
+                                  '#aaa': {'color': '#aaa'},
+                                  '2em groove': {'width':'2em',
+                                                 'style':'groove'}}.items():
                 for edge in EDGES:
                     br = 'border-%s' % edge
                     val = tuple(parseStyle('%s: %s' % (br, raw), validate=False))[0].cssValue
                     self.assertDictEqual(border_edge_dict(expected, edge), normalizers[br](br, val))
 
-            for raw, expected in iteritems({
-                'solid 1px red': {'color':'red', 'width':'1px', 'style':'solid'},
-                '1px': {'width': '1px'}, '#aaa': {'color': '#aaa'},
-                'thin groove': {'width':'thin', 'style':'groove'},
-            }):
+            for raw, expected in {'solid 1px red': {'color':'red',
+                                                    'width':'1px',
+                                                    'style':'solid'},
+                                  '1px': {'width': '1px'},
+                                  '#aaa': {'color': '#aaa'},
+                                  'thin groove': {'width':'thin',
+                                                  'style':'groove'}}.items():
                 val = tuple(parseStyle('%s: %s' % ('border', raw), validate=False))[0].cssValue
                 self.assertDictEqual(border_dict(expected), normalizers['border']('border', val))
 
-            for name, val in iteritems({
-                'width': '10%', 'color': 'rgb(0, 1, 1)', 'style': 'double',
-            }):
+            for name, val in {'width': '10%',
+                              'color': 'rgb(0, 1, 1)',
+                              'style': 'double'}.items():
                 cval = tuple(parseStyle('border-%s: %s' % (name, val), validate=False))[0].cssValue
                 self.assertDictEqual(border_val_dict(val, name), normalizers['border-'+name]('border-'+name, cval))
 
         def test_edge_normalization(self):
             def edge_dict(prefix, expected):
                 return {'%s-%s' % (prefix, edge) : x for edge, x in zip(EDGES, expected)}
-            for raw, expected in iteritems({
-                '2px': ('2px', '2px', '2px', '2px'),
-                '1em 2em': ('1em', '2em', '1em', '2em'),
-                '1em 2em 3em': ('1em', '2em', '3em', '2em'),
-                '1 2 3 4': ('1', '2', '3', '4'),
-            }):
+            for raw, expected in {'2px': ('2px', '2px', '2px', '2px'),
+                                  '1em 2em': ('1em', '2em', '1em', '2em'),
+                                  '1em 2em 3em': ('1em', '2em', '3em', '2em'),
+                                  '1 2 3 4': ('1', '2', '3', '4')}.items():
                 for prefix in ('margin', 'padding'):
                     cval = tuple(parseStyle('%s: %s' % (prefix, raw), validate=False))[0].cssValue
                     self.assertDictEqual(edge_dict(prefix, expected), normalizers[prefix](prefix, cval))
@@ -352,14 +370,13 @@ def test_normalization(return_tests=False):  # {{{
         def test_list_style_normalization(self):
             def ls_dict(expected):
                 ans = {'list-style-%s' % x : DEFAULTS['list-style-%s' % x] for x in ('type', 'image', 'position')}
-                for k, v in iteritems(expected):
+                for k, v in expected.items():
                     ans['list-style-%s' % k] = v
                 return ans
-            for raw, expected in iteritems({
-                'url(http://www.example.com/images/list.png)': {'image': 'url(http://www.example.com/images/list.png)'},
-                'inside square': {'position':'inside', 'type':'square'},
-                'upper-roman url(img) outside': {'position':'outside', 'type':'upper-roman', 'image':'url(img)'},
-            }):
+            for raw, expected in {'url(http://www.example.com/images/list.png)': {'image': 'url(http://www.example.com/images/list.png)'},
+                                  'inside square': {'position':'inside', 'type':'square'},
+                                  'upper-roman url(img) outside': {'position':'outside', 'type':'upper-roman', 'image':'url(img)'},
+                                 }.items():
                 cval = tuple(parseStyle('list-style: %s' % raw, validate=False))[0].cssValue
                 self.assertDictEqual(ls_dict(expected), normalizers['list-style']('list-style', cval))
 
@@ -379,20 +396,18 @@ def test_normalization(return_tests=False):  # {{{
             ae({'list-style', 'list-style-image', 'list-style-type', 'list-style-position'}, normalize_filter_css({'list-style'}))
 
         def test_edge_condensation(self):
-            for s, v in iteritems({
-                (1, 1, 3) : None,
-                (1, 2, 3, 4) : '2pt 3pt 4pt 1pt',
-                (1, 2, 3, 2) : '2pt 3pt 2pt 1pt',
-                (1, 2, 1, 3) : '2pt 1pt 3pt',
-                (1, 2, 1, 2) : '2pt 1pt',
-                (1, 1, 1, 1) : '1pt',
-                ('2%', '2%', '2%', '2%') : '2%',
-                tuple('0 0 0 0'.split()) : '0',
-            }):
+            for s, v in {(1, 1, 3) : None,
+                         (1, 2, 3, 4) : '2pt 3pt 4pt 1pt',
+                         (1, 2, 3, 2) : '2pt 3pt 2pt 1pt',
+                         (1, 2, 1, 3) : '2pt 1pt 3pt',
+                         (1, 2, 1, 2) : '2pt 1pt',
+                         (1, 1, 1, 1) : '1pt',
+                         ('2%', '2%', '2%', '2%') : '2%',
+                         tuple('0 0 0 0'.split()) : '0'}.items():
                 for prefix in ('margin', 'padding'):
                     css = {'%s-%s' % (prefix, x) : str(y)+'pt' if isinstance(y, numbers.Number) else y
                             for x, y in zip(('left', 'top', 'right', 'bottom'), s)}
-                    css = '; '.join(('%s:%s' % (k, v) for k, v in iteritems(css)))
+                    css = '; '.join(('%s:%s' % (k, v) for k, v in css.items()))
                     style = parseStyle(css)
                     condense_rule(style)
                     val = getattr(style.getProperty(prefix), 'value', None)
diff --git a/ebook_converter/ebooks/oeb/parse_utils.py b/ebook_converter/ebooks/oeb/parse_utils.py
index b40227c..df32624 100644
--- a/ebook_converter/ebooks/oeb/parse_utils.py
+++ b/ebook_converter/ebooks/oeb/parse_utils.py
@@ -6,7 +6,6 @@ from ebook_converter import xml_replace_entities, force_unicode
 from ebook_converter.utils.xml_parse import safe_xml_fromstring
 from ebook_converter.constants import filesystem_encoding
 from ebook_converter.ebooks.chardet import xml_to_unicode, strip_encoding_declarations
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -136,8 +135,8 @@ def clean_word_doc(data, log):
 
 
 def ensure_namespace_prefixes(node, nsmap):
-    namespace_uris = frozenset(itervalues(nsmap))
-    fnsmap = {k:v for k, v in iteritems(node.nsmap) if v not in namespace_uris}
+    namespace_uris = frozenset(nsmap.values())
+    fnsmap = {k:v for k, v in node.nsmap.items() if v not in namespace_uris}
     fnsmap.update(nsmap)
     if fnsmap != dict(node.nsmap):
         node = clone_element(node, nsmap=fnsmap, in_context=False)
@@ -230,7 +229,7 @@ def parse_html(data, log=None, decoder=None, preprocessor=None,
         for x in data.iterdescendants():
             try:
                 x.tag = x.tag.lower()
-                for key, val in list(iteritems(x.attrib)):
+                for key, val in tuple(x.attrib.items()):
                     del x.attrib[key]
                     key = key.lower()
                     x.attrib[key] = val
diff --git a/ebook_converter/ebooks/oeb/polish/container.py b/ebook_converter/ebooks/oeb/polish/container.py
index d4942df..a62d32c 100644
--- a/ebook_converter/ebooks/oeb/polish/container.py
+++ b/ebook_converter/ebooks/oeb/polish/container.py
@@ -49,7 +49,6 @@ from ebook_converter.utils.ipc.simple_worker import WorkerError, fork_job
 from ebook_converter.utils.logging import default_log
 from ebook_converter.utils.xml_parse import safe_xml_fromstring
 from ebook_converter.utils.zipfile import ZipFile
-from ebook_converter.polyglot.builtins import iteritems
 
 exists, join, relpath = os.path.exists, os.path.join, os.path.relpath
 
@@ -306,7 +305,7 @@ class Container(ContainerBase):  # {{{
             'tweak_mode': self.tweak_mode,
             'name_path_map': {
                 name:os.path.join(dest_dir, os.path.relpath(path, self.root))
-                for name, path in iteritems(self.name_path_map)}
+                for name, path in self.name_path_map.items()}
         }
 
     def clone_data(self, dest_dir):
@@ -667,7 +666,7 @@ class Container(ContainerBase):  # {{{
         for item in self.opf_xpath('//opf:manifest/opf:item[@href and @media-type]'):
             ans[item.get('media-type').lower()].append(self.href_to_name(
                 item.get('href'), self.opf_name))
-        return {mt:tuple(v) for mt, v in iteritems(ans)}
+        return {mt:tuple(v) for mt, v in ans.items()}
 
     def manifest_items_with_property(self, property_name):
         ' All manifest items that have the specified property '
@@ -685,7 +684,7 @@ class Container(ContainerBase):  # {{{
             predicate = predicate.__eq__
         elif hasattr(predicate, '__contains__'):
             predicate = predicate.__contains__
-        for mt, names in iteritems(self.manifest_type_map):
+        for mt, names in self.manifest_type_map.items():
             if predicate(mt):
                 for name in names:
                     yield name
@@ -807,7 +806,7 @@ class Container(ContainerBase):  # {{{
         the form (name, linear). Will raise an error if one of the names is not
         present in the manifest. '''
         imap = self.manifest_id_map
-        imap = {name:item_id for item_id, name in iteritems(imap)}
+        imap = {name:item_id for item_id, name in imap.items()}
         items = [item for item, name, linear in self.spine_iter]
         tail, last_tail = (items[0].tail, items[-1].tail) if items else ('\n    ', '\n  ')
         tuple(map(self.remove_from_xml, items))
@@ -1071,7 +1070,7 @@ class Container(ContainerBase):  # {{{
         if set(self.name_path_map) != set(other.name_path_map):
             return 'Set of files is not the same'
         mismatches = []
-        for name, path in iteritems(self.name_path_map):
+        for name, path in self.name_path_map.items():
             opath = other.name_path_map[name]
             with open(path, 'rb') as f1, open(opath, 'rb') as f2:
                 if f1.read() != f2.read():
@@ -1275,7 +1274,7 @@ class EpubContainer(Container):
             return
 
         package_id = raw_unique_identifier = idpf_key = None
-        for attrib, val in iteritems(self.opf.attrib):
+        for attrib, val in self.opf.attrib.items():
             if attrib.endswith('unique-identifier'):
                 package_id = val
                 break
@@ -1304,7 +1303,7 @@ class EpubContainer(Container):
                     self.log.exception('Failed to parse obfuscation key')
                     key = None
 
-        for font, alg in iteritems(fonts):
+        for font, alg in fonts.items():
             tkey = key if alg == ADOBE_OBFUSCATION else idpf_key
             if not tkey:
                 raise ObfuscationKeyMissing('Failed to find obfuscation key')
@@ -1374,7 +1373,7 @@ class EpubContainer(Container):
                     et = et.encode('ascii')
                 f.write(et)
             zip_rebuilder(self.root, outpath)
-            for name, data in iteritems(restore_fonts):
+            for name, data in restore_fonts.items():
                 with self.open(name, 'wb') as f:
                     f.write(data)
 
diff --git a/ebook_converter/ebooks/oeb/polish/css.py b/ebook_converter/ebooks/oeb/polish/css.py
index 54605f5..8982896 100644
--- a/ebook_converter/ebooks/oeb/polish/css.py
+++ b/ebook_converter/ebooks/oeb/polish/css.py
@@ -10,7 +10,6 @@ from ebook_converter.ebooks.oeb.normalize_css import normalize_filter_css, norma
 from ebook_converter.ebooks.oeb.polish.pretty import pretty_script_or_style, pretty_xml_tree, serialize
 from ebook_converter.utils.icu import numeric_sort_key
 from ebook_converter.css_selectors import Select, SelectorError
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -60,7 +59,7 @@ def merge_identical_selectors(sheet):
     for rule in sheet.cssRules.rulesOfType(CSSRule.STYLE_RULE):
         selector_map[rule.selectorText].append(rule)
     remove = []
-    for rule_group in itervalues(selector_map):
+    for rule_group in selector_map.values():
         if len(rule_group) > 1:
             for i in range(1, len(rule_group)):
                 merge_declarations(rule_group[0].style, rule_group[i].style)
@@ -85,23 +84,23 @@ def remove_unused_css(container, report=None, remove_unused_classes=False, merge
             return container.parsed(name)
         except TypeError:
             pass
-    sheets = {name:safe_parse(name) for name, mt in iteritems(container.mime_map) if mt in OEB_STYLES}
-    sheets = {k:v for k, v in iteritems(sheets) if v is not None}
+    sheets = {name:safe_parse(name) for name, mt in container.mime_map.items() if mt in OEB_STYLES}
+    sheets = {k:v for k, v in sheets.items() if v is not None}
     num_merged = 0
     if merge_rules:
-        for name, sheet in iteritems(sheets):
+        for name, sheet in sheets.items():
             num = merge_identical_selectors(sheet)
             if num:
                 container.dirty(name)
                 num_merged += num
     import_map = {name:get_imported_sheets(name, container, sheets) for name in sheets}
     if remove_unused_classes:
-        class_map = {name:{icu_lower(x) for x in classes_in_rule_list(sheet.cssRules)} for name, sheet in iteritems(sheets)}
-    style_rules = {name:tuple(sheet.cssRules.rulesOfType(CSSRule.STYLE_RULE)) for name, sheet in iteritems(sheets)}
+        class_map = {name:{icu_lower(x) for x in classes_in_rule_list(sheet.cssRules)} for name, sheet in sheets.items()}
+    style_rules = {name:tuple(sheet.cssRules.rulesOfType(CSSRule.STYLE_RULE)) for name, sheet in sheets.items()}
 
     num_of_removed_rules = num_of_removed_classes = 0
 
-    for name, mt in iteritems(container.mime_map):
+    for name, mt in container.mime_map.items():
         if mt not in OEB_DOCS:
             continue
         root = container.parsed(name)
@@ -158,7 +157,7 @@ def remove_unused_css(container, report=None, remove_unused_classes=False, merge
                     num_of_removed_classes += len(original_classes) - len(classes)
                     container.dirty(name)
 
-    for name, sheet in iteritems(sheets):
+    for name, sheet in sheets.items():
         unused_rules = style_rules[name]
         if unused_rules:
             num_of_removed_rules += len(unused_rules)
@@ -245,7 +244,7 @@ def transform_css(container, transform_sheet=None, transform_style=None, names=(
     if not names:
         types = OEB_STYLES | OEB_DOCS
         names = []
-        for name, mt in iteritems(container.mime_map):
+        for name, mt in container.mime_map.items():
             if mt in types:
                 names.append(name)
 
diff --git a/ebook_converter/ebooks/oeb/polish/pretty.py b/ebook_converter/ebooks/oeb/polish/pretty.py
index 27e0868..402a546 100644
--- a/ebook_converter/ebooks/oeb/polish/pretty.py
+++ b/ebook_converter/ebooks/oeb/polish/pretty.py
@@ -1,5 +1,4 @@
 import textwrap
-from ebook_converter.polyglot.builtins import iteritems
 
 # from lxml.etree import Element
 
@@ -219,7 +218,7 @@ def pretty_xml(container, name, raw):
 
 def fix_all_html(container):
     ' Fix any parsing errors in all HTML files in the container. Fixing is done using the HTML5 parsing algorithm. '
-    for name, mt in iteritems(container.mime_map):
+    for name, mt in container.mime_map.items():
         if mt in OEB_DOCS:
             container.parsed(name)
             container.dirty(name)
@@ -228,7 +227,7 @@ def fix_all_html(container):
 def pretty_all(container):
     ' Pretty print all HTML/CSS/XML files in the container '
     xml_types = {guess_type('a.ncx'), guess_type('a.xml'), guess_type('a.svg')}
-    for name, mt in iteritems(container.mime_map):
+    for name, mt in container.mime_map.items():
         prettied = False
         if mt in OEB_DOCS:
             pretty_html_tree(container, container.parsed(name))
diff --git a/ebook_converter/ebooks/oeb/polish/replace.py b/ebook_converter/ebooks/oeb/polish/replace.py
index be7090f..58d1b73 100644
--- a/ebook_converter/ebooks/oeb/polish/replace.py
+++ b/ebook_converter/ebooks/oeb/polish/replace.py
@@ -1,5 +1,4 @@
 import codecs, shutil, os, posixpath
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 from functools import partial
 from collections import Counter, defaultdict
 import urllib.parse
@@ -115,7 +114,7 @@ def replace_links(container, link_map, frag_map=lambda name, frag:frag, replace_
     :param replace_in_opf: If False, links are not replaced in the OPF file.
 
     '''
-    for name, media_type in iteritems(container.mime_map):
+    for name, media_type in container.mime_map.items():
         if name == container.opf_name and not replace_in_opf:
             continue
         repl = LinkReplacer(name, container, link_map, frag_map)
@@ -131,7 +130,7 @@ def replace_ids(container, id_map):
 
     '''
     changed = False
-    for name, media_type in iteritems(container.mime_map):
+    for name, media_type in container.mime_map.items():
         repl = IdReplacer(name, container, id_map)
         container.replace_links(name, repl)
         if name == container.opf_name:
@@ -183,19 +182,19 @@ def rename_files(container, file_map):
     :param file_map: A mapping of old canonical name to new canonical name, for
         example: :code:`{'text/chapter1.html': 'chapter1.html'}`.
     '''
-    overlap = set(file_map).intersection(set(itervalues(file_map)))
+    overlap = set(file_map).intersection(set(file_map.values()))
     if overlap:
         raise ValueError('Circular rename detected. The files %s are both rename targets and destinations' % ', '.join(overlap))
-    for name, dest in iteritems(file_map):
+    for name, dest in file_map.items():
         if container.exists(dest):
             if name != dest and name.lower() == dest.lower():
                 # A case change on an OS with a case insensitive file-system.
                 continue
             raise ValueError('Cannot rename {0} to {1} as {1} already exists'.format(name, dest))
-    if len(tuple(itervalues(file_map))) != len(set(itervalues(file_map))):
+    if len(file_map.values()) != len(set(file_map.values())):
         raise ValueError('Cannot rename, the set of destination files contains duplicates')
     link_map = {}
-    for current_name, new_name in iteritems(file_map):
+    for current_name, new_name in file_map.items():
         container.rename(current_name, new_name)
         if new_name != container.opf_name:  # OPF is handled by the container
             link_map[current_name] = new_name
@@ -217,7 +216,7 @@ def replace_file(container, name, path, basename, force_mt=None):
             rename_files(container, {name:nname})
             mt = force_mt or container.guess_type(nname)
             container.mime_map[nname] = mt
-            for itemid, q in iteritems(container.manifest_id_map):
+            for itemid, q in container.manifest_id_map.items():
                 if q == nname:
                     for item in container.opf_xpath('//opf:manifest/opf:item[@href and @id="%s"]' % itemid):
                         item.set('media-type', mt)
@@ -252,7 +251,7 @@ def get_recommended_folders(container, names):
     recommended folder is assumed to be the folder containing the OPF file. '''
     from ebook_converter.ebooks.oeb.polish.utils import guess_type
     counts = defaultdict(Counter)
-    for name, mt in iteritems(container.mime_map):
+    for name, mt in container.mime_map.items():
         folder = name.rpartition('/')[0] if '/' in name else ''
         counts[mt_to_category(container, mt)][folder] += 1
 
@@ -261,7 +260,7 @@ def get_recommended_folders(container, names):
     except KeyError:
         opf_folder = ''
 
-    recommendations = {category:counter.most_common(1)[0][0] for category, counter in iteritems(counts)}
+    recommendations = {category:counter.most_common(1)[0][0] for category, counter in counts.items()}
     return {n:recommendations.get(mt_to_category(container, guess_type(os.path.basename(n))), opf_folder) for n in names}
 
 
@@ -348,7 +347,7 @@ def remove_links_to(container, predicate):
     stylepath = XPath('//h:style')
     styleattrpath = XPath('//*[@style]')
     changed = set()
-    for name, mt in iteritems(container.mime_map):
+    for name, mt in container.mime_map.items():
         removed = False
         if mt in OEB_DOCS:
             root = container.parsed(name)
diff --git a/ebook_converter/ebooks/oeb/polish/split.py b/ebook_converter/ebooks/oeb/polish/split.py
index 814525d..0a8c1d9 100644
--- a/ebook_converter/ebooks/oeb/polish/split.py
+++ b/ebook_converter/ebooks/oeb/polish/split.py
@@ -5,7 +5,6 @@ from ebook_converter.ebooks.oeb.base import barename, XPNSMAP, XPath, OPF, XHTML
 from ebook_converter.ebooks.oeb.polish.errors import MalformedMarkup
 from ebook_converter.ebooks.oeb.polish.toc import node_from_loc
 from ebook_converter.ebooks.oeb.polish.replace import LinkRebaser
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -237,7 +236,7 @@ def split(container, name, loc_or_xpath, before=True, totals=None):
                         a.set('href', '#' + purl.fragment)
 
     # Fix all links in the container that point to anchors in the bottom tree
-    for fname, media_type in iteritems(container.mime_map):
+    for fname, media_type in container.mime_map.items():
         if fname not in {name, bottom_name}:
             repl = SplitLinkReplacer(fname, anchors_in_bottom, name, bottom_name, container)
             container.replace_links(fname, repl)
@@ -438,7 +437,7 @@ def merge_html(container, names, master, insert_page_breaks=False):
         container.remove_item(name, remove_from_guide=False)
 
     # Fix all links in the container that point to merged files
-    for fname, media_type in iteritems(container.mime_map):
+    for fname, media_type in container.mime_map.items():
         repl = MergeLinkReplacer(fname, anchor_map, master, container)
         container.replace_links(fname, repl)
 
@@ -471,7 +470,7 @@ def merge_css(container, names, master):
 
     # Remove links to merged stylesheets in the html files, replacing with a
     # link to the master sheet
-    for name, mt in iteritems(container.mime_map):
+    for name, mt in container.mime_map.items():
         if mt in OEB_DOCS:
             removed = False
             root = p(name)
diff --git a/ebook_converter/ebooks/oeb/polish/toc.py b/ebook_converter/ebooks/oeb/polish/toc.py
index 41b5f57..6b1b607 100644
--- a/ebook_converter/ebooks/oeb/polish/toc.py
+++ b/ebook_converter/ebooks/oeb/polish/toc.py
@@ -16,7 +16,6 @@ from ebook_converter.ebooks.oeb.polish.utils import guess_type, extract
 from ebook_converter.ebooks.oeb.polish.opf import set_guide_item, get_book_language
 from ebook_converter.ebooks.oeb.polish.pretty import pretty_html_tree
 from ebook_converter.utils.localization import get_lang, canonicalize_lang, lang_as_iso639_1
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -168,7 +167,7 @@ def parse_ncx(container, ncx_name):
     if navmaps:
         process_ncx_node(container, navmaps[0], toc_root, ncx_name)
     toc_root.lang = toc_root.uid = None
-    for attr, val in iteritems(root.attrib):
+    for attr, val in root.attrib.items():
         if attr.endswith('lang'):
             toc_root.lang = str(val)
             break
@@ -415,14 +414,14 @@ def from_xpaths(container, xpaths):
         name = container.abspath_to_name(spinepath)
         root = container.parsed(name)
         level_item_map = maps[name] = {i+1:frozenset(xp(root)) for i, xp in enumerate(xpaths)}
-        for lvl, elems in iteritems(level_item_map):
+        for lvl, elems in level_item_map.items():
             if elems:
                 empty_levels.discard(lvl)
     # Remove empty levels from all level_maps
     if empty_levels:
-        for name, lmap in tuple(iteritems(maps)):
-            lmap = {lvl:items for lvl, items in iteritems(lmap) if lvl not in empty_levels}
-            lmap = sorted(iteritems(lmap), key=itemgetter(0))
+        for name, lmap in tuple(maps.items()):
+            lmap = {lvl:items for lvl, items in lmap.items() if lvl not in empty_levels}
+            lmap = sorted(lmap.items(), key=itemgetter(0))
             lmap = {i+1:items for i, (l, items) in enumerate(lmap)}
             maps[name] = lmap
 
@@ -440,9 +439,9 @@ def from_xpaths(container, xpaths):
 
         return process_node(tocroot)
 
-    for name, level_item_map in iteritems(maps):
+    for name, level_item_map in maps.items():
         root = container.parsed(name)
-        item_level_map = {e:i for i, elems in iteritems(level_item_map) for e in elems}
+        item_level_map = {e:i for i, elems in level_item_map.items() for e in elems}
         item_dirtied = False
         all_ids = set(root.xpath('//*/@id'))
 
diff --git a/ebook_converter/ebooks/oeb/stylizer.py b/ebook_converter/ebooks/oeb/stylizer.py
index 0475e1a..178579e 100644
--- a/ebook_converter/ebooks/oeb/stylizer.py
+++ b/ebook_converter/ebooks/oeb/stylizer.py
@@ -15,7 +15,6 @@ from ebook_converter.ebooks import unit_convert
 from ebook_converter.ebooks.oeb.base import XHTML, XHTML_NS, CSS_MIME, OEB_STYLES, xpath, urlnormalize
 from ebook_converter.ebooks.oeb.normalize_css import DEFAULTS, normalizers
 from ebook_converter.css_selectors import Select, SelectorError, INAPPROPRIATE_PSEUDO_CLASSES
-from ebook_converter.polyglot.builtins import iteritems
 from ebook_converter.tinycss.media3 import CSSMedia3Parser
 
 
@@ -785,7 +784,7 @@ class Style(object):
             self._get('padding-right'), base=self.parent_width)
 
     def __str__(self):
-        items = sorted(iteritems(self._style))
+        items = sorted(self._style.items())
         return '; '.join("%s: %s" % (key, val) for key, val in items)
 
     def cssdict(self):
@@ -794,12 +793,12 @@ class Style(object):
     def pseudo_classes(self, filter_css):
         if filter_css:
             css = copy.deepcopy(self._pseudo_classes)
-            for psel, cssdict in iteritems(css):
+            for psel, cssdict in css.items():
                 for k in filter_css:
                     cssdict.pop(k, None)
         else:
             css = self._pseudo_classes
-        return {k:v for k, v in iteritems(css) if v}
+        return {k:v for k, v in css.items() if v}
 
     @property
     def is_hidden(self):
diff --git a/ebook_converter/ebooks/oeb/transforms/flatcss.py b/ebook_converter/ebooks/oeb/transforms/flatcss.py
index 1110aef..3696e0a 100644
--- a/ebook_converter/ebooks/oeb/transforms/flatcss.py
+++ b/ebook_converter/ebooks/oeb/transforms/flatcss.py
@@ -16,7 +16,6 @@ from ebook_converter.ebooks.oeb.base import (XHTML, XHTML_NS, CSS_MIME, OEB_STYL
 from ebook_converter.ebooks.oeb.stylizer import Stylizer
 from ebook_converter.utils.filenames import ascii_filename, ascii_text
 from ebook_converter.utils.icu import numeric_sort_key
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -208,7 +207,7 @@ class CSSFlattener(object):
 
     def store_page_margins(self):
         self.opts._stored_page_margins = {}
-        for item, stylizer in iteritems(self.stylizers):
+        for item, stylizer in self.stylizers.items():
             margins = self.opts._stored_page_margins[item.href] = {}
             for prop, val in stylizer.page_rule.items():
                 p, w = prop.partition('-')[::2]
@@ -262,7 +261,7 @@ class CSSFlattener(object):
                 if font[k] != 'normal':
                     cfont[k] = font[k]
             rule = '@font-face { %s }'%('; '.join('%s:%s'%(k, v) for k, v in
-                iteritems(cfont)))
+                cfont.items()))
             rule = css_parser.parseString(rule)
             efi.append(rule)
 
@@ -527,7 +526,7 @@ class CSSFlattener(object):
             keep_classes = set()
 
             if cssdict:
-                items = sorted(iteritems(cssdict))
+                items = sorted(cssdict.items())
                 css = ';\n'.join(u'%s: %s' % (key, val) for key, val in items)
                 classes = node.get('class', '').strip() or 'calibre'
                 classes_list = classes.split()
@@ -544,8 +543,8 @@ class CSSFlattener(object):
                 node.attrib['class'] = match
                 keep_classes.add(match)
 
-            for psel, cssdict in iteritems(pseudo_classes):
-                items = sorted(iteritems(cssdict))
+            for psel, cssdict in pseudo_classes.items():
+                items = sorted(cssdict.items())
                 css = ';\n'.join('%s: %s' % (key, val) for key, val in items)
                 pstyles = pseudo_styles[psel]
                 if css in pstyles:
@@ -647,7 +646,7 @@ class CSSFlattener(object):
             gc_map[css] = href
 
         ans = {}
-        for css, items in iteritems(global_css):
+        for css, items in global_css.items():
             for item in items:
                 ans[item] = gc_map[css]
         return ans
@@ -663,7 +662,7 @@ class CSSFlattener(object):
             fsize = self.context.dest.fbase
             self.flatten_node(html, stylizer, names, styles, pseudo_styles, fsize, item.id, recurse=False)
             self.flatten_node(html.find(XHTML('body')), stylizer, names, styles, pseudo_styles, fsize, item.id)
-        items = sorted(((key, val) for (val, key) in iteritems(styles)))
+        items = sorted(((key, val) for (val, key) in styles.items()))
         # :hover must come after link and :active must come after :hover
         psels = sorted(pseudo_styles, key=lambda x :
                 {'hover':1, 'active':2}.get(x, 0))
@@ -671,7 +670,7 @@ class CSSFlattener(object):
             styles = pseudo_styles[psel]
             if not styles:
                 continue
-            x = sorted(((k+':'+psel, v) for v, k in iteritems(styles)))
+            x = sorted(((k+':'+psel, v) for v, k in styles.items()))
             items.extend(x)
 
         css = ''.join(".%s {\n%s;\n}\n\n" % (key, val) for key, val in items)
diff --git a/ebook_converter/ebooks/oeb/transforms/metadata.py b/ebook_converter/ebooks/oeb/transforms/metadata.py
index 2211bee..c08a840 100644
--- a/ebook_converter/ebooks/oeb/transforms/metadata.py
+++ b/ebook_converter/ebooks/oeb/transforms/metadata.py
@@ -1,7 +1,6 @@
 import os, re
 from ebook_converter.utils.date import isoformat, now
 from ebook_converter import guess_type
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -48,7 +47,7 @@ def meta_info_to_oeb_metadata(mi, m, log, override_input_metadata=False):
         m.clear('series')
     identifiers = mi.get_identifiers()
     set_isbn = False
-    for typ, val in iteritems(identifiers):
+    for typ, val in identifiers.items():
         has = False
         if typ.lower() == 'isbn':
             set_isbn = True
diff --git a/ebook_converter/ebooks/oeb/transforms/page_margin.py b/ebook_converter/ebooks/oeb/transforms/page_margin.py
index f464355..8c4e232 100644
--- a/ebook_converter/ebooks/oeb/transforms/page_margin.py
+++ b/ebook_converter/ebooks/oeb/transforms/page_margin.py
@@ -2,7 +2,6 @@ import numbers
 from collections import Counter
 
 from ebook_converter.ebooks.oeb.base import barename, XPath
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -149,7 +148,7 @@ class RemoveFakeMargins(object):
                 self.levels[level].append(p)
 
         remove = set()
-        for k, v in iteritems(self.levels):
+        for k, v in self.levels.items():
             num = len(v)
             self.log.debug('Found %d items of level:'%num, k)
             level = int(k.split('_')[-1])
diff --git a/ebook_converter/ebooks/oeb/transforms/split.py b/ebook_converter/ebooks/oeb/transforms/split.py
index 650653d..6c324e7 100644
--- a/ebook_converter/ebooks/oeb/transforms/split.py
+++ b/ebook_converter/ebooks/oeb/transforms/split.py
@@ -15,7 +15,6 @@ from ebook_converter.ebooks.epub import rules
 from ebook_converter.ebooks.oeb.base import (OEB_STYLES, XPNSMAP as NAMESPACES,
         rewrite_links, XHTML, urlnormalize)
 from ebook_converter.ebooks.oeb.polish.split import do_split
-from ebook_converter.polyglot.builtins import iteritems
 from ebook_converter.polyglot.urllib import unquote
 from ebook_converter.css_selectors import Select, SelectorError
 
@@ -243,7 +242,7 @@ class FlowSplitter(object):
 
         self.trees = [orig_tree]
         while ordered_ids:
-            pb_id, (pattern, before) = next(iteritems(ordered_ids))
+            pb_id, (pattern, before) = next(iter(ordered_ids.items()))
             del ordered_ids[pb_id]
             for i in range(len(self.trees)-1, -1, -1):
                 tree = self.trees[i]
diff --git a/ebook_converter/ebooks/oeb/transforms/structure.py b/ebook_converter/ebooks/oeb/transforms/structure.py
index b4a3497..ea61e8c 100644
--- a/ebook_converter/ebooks/oeb/transforms/structure.py
+++ b/ebook_converter/ebooks/oeb/transforms/structure.py
@@ -7,7 +7,6 @@ from collections import OrderedDict, Counter
 
 from ebook_converter.ebooks.oeb.base import XPNSMAP, TOC, XHTML, xml2text, barename
 from ebook_converter.ebooks import ConversionError
-from ebook_converter.polyglot.builtins import itervalues
 
 
 __license__ = 'GPL v3'
@@ -269,8 +268,8 @@ class DetectStructure(object):
                 return []
 
         for document in self.oeb.spine:
-            previous_level1 = list(itervalues(added))[-1] if added else None
-            previous_level2 = list(itervalues(added2))[-1] if added2 else None
+            previous_level1 = list(added.values())[-1] if added else None
+            previous_level2 = list(added2.values())[-1] if added2 else None
 
             level1_toc, level1_title = self.get_toc_parts_for_xpath(self.opts.level1_toc)
             for elem in find_matches(level1_toc, document.data):
diff --git a/ebook_converter/ebooks/oeb/transforms/subset.py b/ebook_converter/ebooks/oeb/transforms/subset.py
index ed47a90..63044ae 100644
--- a/ebook_converter/ebooks/oeb/transforms/subset.py
+++ b/ebook_converter/ebooks/oeb/transforms/subset.py
@@ -2,7 +2,6 @@ from collections import defaultdict
 
 from ebook_converter.ebooks.oeb.base import urlnormalize, css_text
 from ebook_converter.utils.fonts.sfnt.subset import subset, NoGlyphs, UnsupportedFont
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 from ebook_converter.tinycss.fonts3 import parse_font_family
 
 
@@ -148,7 +147,7 @@ class SubsetFonts(object):
             else:
                 fonts[item.href] = font
 
-        for font in itervalues(fonts):
+        for font in fonts.values():
             if not font['chars']:
                 self.log('The font %s is unused. Removing it.'%font['src'])
                 remove(font)
@@ -167,8 +166,8 @@ class SubsetFonts(object):
                 totals[1] += sz
             else:
                 font['item'].data = raw
-                nlen = sum(itervalues(new_stats))
-                olen = sum(itervalues(old_stats))
+                nlen = sum(new_stats.values())
+                olen = sum(old_stats.values())
                 self.log('Decreased the font %s to %.1f%% of its original size'%
                         (font['src'], nlen/olen *100))
                 totals[0] += nlen
@@ -204,7 +203,7 @@ class SubsetFonts(object):
                 if rule.type != rule.STYLE_RULE:
                     continue
                 props = {k:v for k,v in
-                        iteritems(get_font_properties(rule)) if v}
+                        get_font_properties(rule).items() if v}
                 if not props:
                     continue
                 for sel in rule.selectorList:
diff --git a/ebook_converter/ebooks/pdf/render/common.py b/ebook_converter/ebooks/pdf/render/common.py
index 8db8efa..2407f0f 100644
--- a/ebook_converter/ebooks/pdf/render/common.py
+++ b/ebook_converter/ebooks/pdf/render/common.py
@@ -4,7 +4,6 @@ from datetime import datetime
 
 from ebook_converter.constants import ispy3
 from ebook_converter.utils.logging import default_log
-from ebook_converter.polyglot.builtins import iteritems
 from ebook_converter.polyglot.binary import as_hex_bytes
 
 
@@ -160,7 +159,7 @@ class InlineDictionary(Dictionary):
 
     def pdf_serialize(self, stream):
         stream.write(b'<< ')
-        for k, v in iteritems(self):
+        for k, v in self.items():
             serialize(Name(k), stream)
             stream.write(b' ')
             serialize(v, stream)
diff --git a/ebook_converter/ebooks/rtf2xml/add_brackets.py b/ebook_converter/ebooks/rtf2xml/add_brackets.py
index df61ede..b917a26 100644
--- a/ebook_converter/ebooks/rtf2xml/add_brackets.py
+++ b/ebook_converter/ebooks/rtf2xml/add_brackets.py
@@ -15,7 +15,6 @@ import sys, os
 
 from ebook_converter.ebooks.rtf2xml import copy, check_brackets
 from ebook_converter.ptempfile import better_mktemp
-from ebook_converter.polyglot.builtins import iteritems
 from . import open_for_read, open_for_write
 
 
@@ -163,7 +162,7 @@ class AddBrackets:
             self.__open_bracket = False
 
         inline_string = ''.join(['%s<nu<%s\n' % (k, v)
-                for k, v in iteritems(self.__inline)
+                for k, v in self.__inline.items()
                     if v != 'false'])
         if inline_string:
             self.__write_obj.write('ob<nu<open-brack<0003\n'
diff --git a/ebook_converter/ebooks/txt/processor.py b/ebook_converter/ebooks/txt/processor.py
index 1c0ea85..c0493b9 100644
--- a/ebook_converter/ebooks/txt/processor.py
+++ b/ebook_converter/ebooks/txt/processor.py
@@ -8,7 +8,6 @@ from ebook_converter.ebooks.metadata.opf2 import OPFCreator
 
 from ebook_converter.ebooks.conversion.preprocess import DocAnalysis
 from ebook_converter.utils.cleantext import clean_ascii_chars
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -145,7 +144,7 @@ def convert_markdown_with_metadata(txt, title='', extensions=DEFAULT_MD_EXTENSIO
     html = md.convert(txt)
     mi = Metadata(title or _('Unknown'))
     m = md.Meta
-    for k, v in iteritems({'date':'pubdate', 'summary':'comments'}):
+    for k, v in {'date':'pubdate', 'summary':'comments'}.items():
         if v not in m and k in m:
             m[v] = m.pop(k)
     for k in 'title authors series tags pubdate comments publisher rating'.split():
diff --git a/ebook_converter/library/field_metadata.py b/ebook_converter/library/field_metadata.py
index 40b8586..f578080 100644
--- a/ebook_converter/library/field_metadata.py
+++ b/ebook_converter/library/field_metadata.py
@@ -7,7 +7,6 @@ import traceback
 from collections import OrderedDict
 
 from ebook_converter.utils.config_base import tweaks
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 category_icon_map = {
                     'authors'    : 'user_profile.png',
@@ -485,7 +484,7 @@ class FieldMetadata(object):
             yield key
 
     def itervalues(self):
-        return itervalues(self._tb_cats)
+        return self._tb_cats.values()
 
     def values(self):
         return list(self._tb_cats.values())
@@ -496,7 +495,7 @@ class FieldMetadata(object):
     iter_items = iteritems
 
     def custom_iteritems(self):
-        for key, meta in iteritems(self._tb_custom_fields):
+        for key, meta in self._tb_custom_fields.items():
             yield (key, meta)
 
     def items(self):
@@ -683,8 +682,8 @@ def fm_as_dict(self):
         'custom_fields': self._tb_custom_fields,
         'search_term_map': self._search_term_map,
         'custom_label_to_key_map': self.custom_label_to_key_map,
-        'user_categories': {k:v for k, v in iteritems(self._tb_cats) if v['kind'] == 'user'},
-        'search_categories': {k:v for k, v in iteritems(self._tb_cats) if v['kind'] == 'search'},
+        'user_categories': {k:v for k, v in self._tb_cats.items() if v['kind'] == 'user'},
+        'search_categories': {k:v for k, v in self._tb_cats.items() if v['kind'] == 'search'},
     }
 
 
@@ -694,6 +693,6 @@ def fm_from_dict(src):
     ans._search_term_map = src['search_term_map']
     ans.custom_label_to_key_map = src['custom_label_to_key_map']
     for q in ('custom_fields', 'user_categories', 'search_categories'):
-        for k, v in iteritems(src[q]):
+        for k, v in src[q].items():
             ans._tb_cats[k] = v
     return ans
diff --git a/ebook_converter/polyglot/builtins.py b/ebook_converter/polyglot/builtins.py
index 8b2ef52..48af640 100644
--- a/ebook_converter/polyglot/builtins.py
+++ b/ebook_converter/polyglot/builtins.py
@@ -47,14 +47,6 @@ def error_message(exc):
     return str(exc)
 
 
-def iteritems(d):
-    return iter(d.items())
-
-
-def itervalues(d):
-    return iter(d.values())
-
-
 def environ_item(x):
     if isinstance(x, bytes):
         x = x.decode('utf-8')
diff --git a/ebook_converter/tinycss/tests/fonts3.py b/ebook_converter/tinycss/tests/fonts3.py
index 94d5358..ddc5e1b 100644
--- a/ebook_converter/tinycss/tests/fonts3.py
+++ b/ebook_converter/tinycss/tests/fonts3.py
@@ -1,8 +1,6 @@
 from tinycss.fonts3 import CSSFonts3Parser, parse_font_family, parse_font, serialize_font
 from tinycss.tests import BaseTest
 
-from polyglot.builtins import iteritems
-
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
@@ -29,27 +27,25 @@ class TestFonts3(BaseTest):
 
     def test_parse_font_family(self):
         ' Test parsing of font-family values '
-        for raw, q in iteritems({
-                '"1as"': ['1as'],
-                'A B C, serif': ['A B C', 'serif'],
-                r'Red\/Black': ['Red/Black'],
-                'A  B': ['A B'],
-                r'Ahem\!': ['Ahem!'],
-                r'"Ahem!"': ['Ahem!'],
-                '€42': ['€42'],
-                r'Hawaii\ 5-0': ['Hawaii 5-0'],
-                r'"X \"Y"': ['X "Y'],
-                'A B, C D, "E", serif': ['A B', 'C D', 'E', 'serif'],
-                '': [],
-                '"", a': ['a'],
-        }):
+        for raw, q in {'"1as"': ['1as'],
+                       'A B C, serif': ['A B C', 'serif'],
+                       r'Red\/Black': ['Red/Black'],
+                       'A  B': ['A B'],
+                       r'Ahem\!': ['Ahem!'],
+                       r'"Ahem!"': ['Ahem!'],
+                       '€42': ['€42'],
+                       r'Hawaii\ 5-0': ['Hawaii 5-0'],
+                       r'"X \"Y"': ['X "Y'],
+                       'A B, C D, "E", serif': ['A B', 'C D', 'E', 'serif'],
+                       '': [],
+                       '"", a': ['a']}.items():
             self.ae(q, parse_font_family(raw))
         for single in ('serif', 'sans-serif', 'A B C'):
             self.ae([single], parse_font_family(single))
 
     def test_parse_font(self):
         def t(raw, **kw):
-            q = {('line' if k == 'height' else 'font') + '-' + k:v for k, v in iteritems(kw)}
+            q = {('line' if k == 'height' else 'font') + '-' + k:v for k, v in kw.items()}
             self.ae(q, parse_font(raw))
             self.ae(q, parse_font(serialize_font(q)))
         t('caption', family=['sans-serif'])
diff --git a/ebook_converter/utils/config_base.py b/ebook_converter/utils/config_base.py
index cf72a39..4b61ab1 100644
--- a/ebook_converter/utils/config_base.py
+++ b/ebook_converter/utils/config_base.py
@@ -10,7 +10,6 @@ import pkg_resources
 
 from ebook_converter.utils.lock import ExclusiveFile
 from ebook_converter.constants import config_dir, CONFIG_DIR_MODE, ispy3, preferred_encoding, filesystem_encoding, iswindows
-from ebook_converter.polyglot.builtins import iteritems
 
 plugin_dir = os.path.join(config_dir, 'plugins')
 
@@ -92,7 +91,7 @@ def force_unicode_recursive(obj):
     if isinstance(obj, (list, tuple)):
         return type(obj)(map(force_unicode_recursive, obj))
     if isinstance(obj, dict):
-        return {force_unicode_recursive(k): force_unicode_recursive(v) for k, v in iteritems(obj)}
+        return {force_unicode_recursive(k): force_unicode_recursive(v) for k, v in obj.items()}
     return obj
 
 
@@ -569,7 +568,7 @@ def make_unicode(obj):
     if isinstance(obj, (list, tuple)):
         return list(map(make_unicode, obj))
     if isinstance(obj, dict):
-        return {make_unicode(k): make_unicode(v) for k, v in iteritems(obj)}
+        return {make_unicode(k): make_unicode(v) for k, v in obj.items()}
     return obj
 
 
@@ -577,7 +576,7 @@ def normalize_tweak(val):
     if isinstance(val, (list, tuple)):
         return tuple(map(normalize_tweak, val))
     if isinstance(val, dict):
-        return {k: normalize_tweak(v) for k, v in iteritems(val)}
+        return {k: normalize_tweak(v) for k, v in val.items()}
     return val
 
 
@@ -586,7 +585,7 @@ def write_custom_tweaks(tweaks_dict):
     tweaks_dict = make_unicode(tweaks_dict)
     changed_tweaks = {}
     default_tweaks = exec_tweaks(default_tweaks_raw())
-    for key, cval in iteritems(tweaks_dict):
+    for key, cval in tweaks_dict.items():
         if key in default_tweaks and normalize_tweak(cval) == normalize_tweak(default_tweaks[key]):
             continue
         changed_tweaks[key] = cval
diff --git a/ebook_converter/utils/filenames.py b/ebook_converter/utils/filenames.py
index 46d220b..aee812c 100644
--- a/ebook_converter/utils/filenames.py
+++ b/ebook_converter/utils/filenames.py
@@ -13,7 +13,6 @@ from ebook_converter.constants import (
     filesystem_encoding, iswindows, plugins, preferred_encoding, isosx, ispy3
 )
 from ebook_converter.utils.localization import get_udc
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 def ascii_text(orig):
@@ -367,7 +366,7 @@ class WindowsAtomicFolderMove(object):
         names = os.listdir(path)
         name_to_fileid = {x:windows_get_fileid(os.path.join(path, x)) for x in names}
         fileid_to_names = defaultdict(set)
-        for name, fileid in iteritems(name_to_fileid):
+        for name, fileid in name_to_fileid.items():
             fileid_to_names[fileid].add(name)
 
         for x in names:
@@ -417,7 +416,7 @@ class WindowsAtomicFolderMove(object):
     def copy_path_to(self, path, dest):
         import win32file
         handle = None
-        for p, h in iteritems(self.handle_map):
+        for p, h in self.handle_map.items():
             if samefile_windows(path, p):
                 handle = h
                 break
@@ -446,20 +445,20 @@ class WindowsAtomicFolderMove(object):
     def release_file(self, path):
         ' Release the lock on the file pointed to by path. Will also release the lock on any hardlinks to path '
         key = None
-        for p, h in iteritems(self.handle_map):
+        for p, h in self.handle_map.items():
             if samefile_windows(path, p):
                 key = (p, h)
                 break
         if key is not None:
             import win32file
             win32file.CloseHandle(key[1])
-            remove = [f for f, h in iteritems(self.handle_map) if h is key[1]]
+            remove = [f for f, h in self.handle_map.items() if h is key[1]]
             for x in remove:
                 self.handle_map.pop(x)
 
     def close_handles(self):
         import win32file
-        for h in itervalues(self.handle_map):
+        for h in self.handle_map.values():
             win32file.CloseHandle(h)
         self.handle_map = {}
 
diff --git a/ebook_converter/utils/fonts/scanner.py b/ebook_converter/utils/fonts/scanner.py
index 706aae3..1e07936 100644
--- a/ebook_converter/utils/fonts/scanner.py
+++ b/ebook_converter/utils/fonts/scanner.py
@@ -6,7 +6,6 @@ from ebook_converter import walk, prints, as_unicode
 from ebook_converter.constants import (config_dir, iswindows, isosx, plugins, DEBUG,
         isworker, filesystem_encoding)
 from ebook_converter.utils.fonts.metadata import FontMetadata, UnsupportedFont
-from ebook_converter.polyglot.builtins import itervalues
 
 
 __license__ = 'GPL v3'
@@ -149,14 +148,14 @@ def path_significance(path, folders):
 
 def build_families(cached_fonts, folders, family_attr='font-family'):
     families = defaultdict(list)
-    for font in itervalues(cached_fonts):
+    for font in cached_fonts.values():
         if not font:
             continue
         lf = (font.get(family_attr) or '').lower()
         if lf:
             families[lf].append(font)
 
-    for fonts in itervalues(families):
+    for fonts in families.values():
         # Look for duplicate font files and choose the copy that is from a
         # more significant font directory (prefer user directories over
         # system directories).
@@ -181,7 +180,7 @@ def build_families(cached_fonts, folders, family_attr='font-family'):
 
     font_family_map = dict.copy(families)
     font_families = tuple(sorted((font[0]['font-family'] for font in
-                                  itervalues(font_family_map))))
+                                  font_family_map.values())))
     return font_family_map, font_families
 # }}}
 
diff --git a/ebook_converter/utils/fonts/sfnt/cff/table.py b/ebook_converter/utils/fonts/sfnt/cff/table.py
index 0bc37ed..b0f7337 100644
--- a/ebook_converter/utils/fonts/sfnt/cff/table.py
+++ b/ebook_converter/utils/fonts/sfnt/cff/table.py
@@ -6,7 +6,6 @@ from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont, NoGlyphs
 from ebook_converter.utils.fonts.sfnt.cff.dict_data import TopDict, PrivateDict
 from ebook_converter.utils.fonts.sfnt.cff.constants import (cff_standard_strings,
         STANDARD_CHARSETS)
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -195,8 +194,8 @@ class CFFTable(UnknownTable):
         # Map codes from the cmap table to glyph names, this will be used to
         # reconstruct character_map for the subset font
         charset_map = {code:self.cff.charset.safe_lookup(glyph_id) for code,
-                glyph_id in iteritems(character_map)}
-        charset = set(itervalues(charset_map))
+                glyph_id in character_map.items()}
+        charset = set(charset_map.values())
         charset.discard(None)
         if not charset and character_map:
             raise NoGlyphs('This font has no glyphs for the specified characters')
@@ -207,7 +206,7 @@ class CFFTable(UnknownTable):
 
         # Rebuild character_map with the glyph ids from the subset font
         character_map.clear()
-        for code, charname in iteritems(charset_map):
+        for code, charname in charset_map.items():
             glyph_id = s.charname_map.get(charname, None)
             if glyph_id:
                 character_map[code] = glyph_id
diff --git a/ebook_converter/utils/fonts/sfnt/common.py b/ebook_converter/utils/fonts/sfnt/common.py
index 85e3f92..303d276 100644
--- a/ebook_converter/utils/fonts/sfnt/common.py
+++ b/ebook_converter/utils/fonts/sfnt/common.py
@@ -2,7 +2,6 @@ from struct import unpack_from, calcsize
 from collections import OrderedDict, namedtuple
 
 from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -78,7 +77,7 @@ class ListTable(OrderedDict):
     def dump(self, prefix=''):
         print(prefix, self.__class__.__name__, sep='')
         prefix += '  '
-        for tag, child in iteritems(self):
+        for tag, child in self.items():
             print(prefix, tag, sep='')
             child.dump(prefix=prefix+'  ')
 
diff --git a/ebook_converter/utils/fonts/sfnt/glyf.py b/ebook_converter/utils/fonts/sfnt/glyf.py
index 1a77964..b0f967b 100644
--- a/ebook_converter/utils/fonts/sfnt/glyf.py
+++ b/ebook_converter/utils/fonts/sfnt/glyf.py
@@ -2,7 +2,6 @@ from struct import unpack_from
 from collections import OrderedDict
 
 from ebook_converter.utils.fonts.sfnt import UnknownTable
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -80,7 +79,7 @@ class GlyfTable(UnknownTable):
         ans = OrderedDict()
         offset = 0
         block = []
-        for glyph_id, glyph in iteritems(sorted_glyph_map):
+        for glyph_id, glyph in sorted_glyph_map.items():
             raw = glyph()
             pad = 4 - (len(raw) % 4)
             if pad < 4:
diff --git a/ebook_converter/utils/fonts/sfnt/gsub.py b/ebook_converter/utils/fonts/sfnt/gsub.py
index dd39c86..d62ae85 100644
--- a/ebook_converter/utils/fonts/sfnt/gsub.py
+++ b/ebook_converter/utils/fonts/sfnt/gsub.py
@@ -6,7 +6,6 @@ from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont
 from ebook_converter.utils.fonts.sfnt.common import (ScriptListTable, FeatureListTable,
         SimpleListTable, LookupTable, ExtensionSubstitution,
         UnknownLookupSubTable)
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -29,7 +28,7 @@ class SingleSubstitution(UnknownLookupSubTable):
         gid_index_map = self.coverage.coverage_indices(glyph_ids)
         if self.format == 1:
             return {gid + self.delta for gid in gid_index_map}
-        return {self.substitutes[i] for i in itervalues(gid_index_map)}
+        return {self.substitutes[i] for i in gid_index_map.values()}
 
 
 class MultipleSubstitution(UnknownLookupSubTable):
@@ -42,7 +41,7 @@ class MultipleSubstitution(UnknownLookupSubTable):
     def all_substitutions(self, glyph_ids):
         gid_index_map = self.coverage.coverage_indices(glyph_ids)
         ans = set()
-        for index in itervalues(gid_index_map):
+        for index in gid_index_map.values():
             glyphs = set(self.coverage_to_subs_map[index])
             ans |= glyphs
         return ans
@@ -67,7 +66,7 @@ class LigatureSubstitution(UnknownLookupSubTable):
     def all_substitutions(self, glyph_ids):
         gid_index_map = self.coverage.coverage_indices(glyph_ids)
         ans = set()
-        for start_glyph_id, index in iteritems(gid_index_map):
+        for start_glyph_id, index in gid_index_map.items():
             for glyph_id, components in self.coverage_to_lig_map[index]:
                 components = (start_glyph_id,) + components
                 if set(components).issubset(glyph_ids):
@@ -126,7 +125,7 @@ class ReverseChainSingleSubstitution(UnknownLookupSubTable):
 
     def all_substitutions(self, glyph_ids):
         gid_index_map = self.coverage.coverage_indices(glyph_ids)
-        return {self.substitutes[i] for i in itervalues(gid_index_map)}
+        return {self.substitutes[i] for i in gid_index_map.values()}
 
 
 subtable_map = {
diff --git a/ebook_converter/utils/fonts/sfnt/loca.py b/ebook_converter/utils/fonts/sfnt/loca.py
index 053e7d3..579d5c9 100644
--- a/ebook_converter/utils/fonts/sfnt/loca.py
+++ b/ebook_converter/utils/fonts/sfnt/loca.py
@@ -3,7 +3,6 @@ from operator import itemgetter
 from itertools import repeat
 
 from ebook_converter.utils.fonts.sfnt import UnknownTable
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
@@ -54,7 +53,7 @@ class LocaTable(UnknownTable):
         max_glyph_id = max(max_glyph_id, current_max_glyph_id)
         self.offset_map = list(repeat(0, max_glyph_id + 2))
         glyphs = [(glyph_id, x[0], x[1]) for glyph_id, x in
-                    iteritems(resolved_glyph_map)]
+                  resolved_glyph_map.items()]
         glyphs.sort(key=itemgetter(1))
         for glyph_id, offset, sz in glyphs:
             self.offset_map[glyph_id] = offset
diff --git a/ebook_converter/utils/fonts/sfnt/subset.py b/ebook_converter/utils/fonts/sfnt/subset.py
index 436cbce..7cf3d94 100644
--- a/ebook_converter/utils/fonts/sfnt/subset.py
+++ b/ebook_converter/utils/fonts/sfnt/subset.py
@@ -6,7 +6,6 @@ from functools import partial
 from ebook_converter.utils.icu import safe_chr, ord_string
 from ebook_converter.utils.fonts.sfnt.container import Sfnt
 from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont, NoGlyphs
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -17,7 +16,7 @@ __docformat__ = 'restructuredtext en'
 
 
 def resolve_glyphs(loca, glyf, character_map, extra_glyphs):
-    unresolved_glyphs = set(itervalues(character_map)) | extra_glyphs
+    unresolved_glyphs = set(character_map.values()) | extra_glyphs
     unresolved_glyphs.add(0)  # We always want the .notdef glyph
     resolved_glyphs = {}
 
@@ -33,7 +32,7 @@ def resolve_glyphs(loca, glyf, character_map, extra_glyphs):
             if gid not in resolved_glyphs:
                 unresolved_glyphs.add(gid)
 
-    return OrderedDict(sorted(iteritems(resolved_glyphs), key=itemgetter(0)))
+    return OrderedDict(sorted(resolved_glyphs.items(), key=itemgetter(0)))
 
 
 def subset_truetype(sfnt, character_map, extra_glyphs):
@@ -52,7 +51,7 @@ def subset_truetype(sfnt, character_map, extra_glyphs):
                 'set, subsetting it is pointless')
 
     # Keep only character codes that have resolved glyphs
-    for code, glyph_id in tuple(iteritems(character_map)):
+    for code, glyph_id in tuple(character_map.items()):
         if glyph_id not in resolved_glyphs:
             del character_map[code]
 
@@ -154,7 +153,7 @@ def subset(raw, individual_chars, ranges=(), warnings=None):
         gsub = sfnt[b'GSUB']
         try:
             gsub.decompile()
-            extra_glyphs = gsub.all_substitutions(itervalues(character_map))
+            extra_glyphs = gsub.all_substitutions(character_map.values())
         except UnsupportedFont as e:
             warn('Usupported GSUB table: %s'%e)
         except Exception:
@@ -175,7 +174,7 @@ def subset(raw, individual_chars, ranges=(), warnings=None):
 
     if b'kern' in sfnt:
         try:
-            sfnt[b'kern'].restrict_to_glyphs(frozenset(itervalues(character_map)))
+            sfnt[b'kern'].restrict_to_glyphs(frozenset(character_map.values()))
         except UnsupportedFont as e:
             warn('kern table unsupported, ignoring: %s'%e)
         except Exception:
@@ -214,8 +213,8 @@ def print_stats(old_stats, new_stats):
     prints('Table', ' ', '%10s'%'Size', '  ', 'Percent', '   ', '%10s'%'New Size',
             ' New Percent')
     prints('='*80)
-    old_total = sum(itervalues(old_stats))
-    new_total = sum(itervalues(new_stats))
+    old_total = sum(old_stats.values())
+    new_total = sum(new_stats.values())
     tables = sorted(old_stats, key=lambda x:old_stats[x],
             reverse=True)
     for table in tables:
@@ -350,7 +349,8 @@ def all():
                 print('Failed!')
                 failed.append((font['full_name'], font['path'], str(e)))
             else:
-                averages.append(sum(itervalues(new_stats))/sum(itervalues(old_stats)) * 100)
+                averages.append(sum(new_stats.values()) /
+                                sum(old_stats.values()) * 100)
                 print('Reduced to:', '%.1f'%averages[-1] , '%')
     if unsupported:
         print('\n\nUnsupported:')
@@ -359,7 +359,7 @@ def all():
             print()
     if warnings:
         print('\n\nWarnings:')
-    for name, w in iteritems(warnings):
+    for name, w in warnings.items():
         if w:
             print(name)
             print('', '\n\t'.join(w), sep='\t')
diff --git a/ebook_converter/utils/fonts/utils.py b/ebook_converter/utils/fonts/utils.py
index 327e341..4cc874b 100644
--- a/ebook_converter/utils/fonts/utils.py
+++ b/ebook_converter/utils/fonts/utils.py
@@ -2,7 +2,7 @@ import struct
 from io import BytesIO
 from collections import defaultdict
 
-from ebook_converter.polyglot.builtins import iteritems, itervalues, as_bytes
+from ebook_converter.polyglot.builtins import as_bytes
 
 
 __license__ = 'GPL v3'
@@ -162,7 +162,7 @@ def decode_name_record(recs):
         return mac_names[0]
 
     # Use unicode names
-    for val in itervalues(unicode_names):
+    for val in unicode_names.values():
         return val
 
     return None
@@ -223,9 +223,10 @@ def get_all_font_names(raw, raw_is_table=False):
     records = _get_font_names(raw, raw_is_table)
     ans = {}
 
-    for name, num in iteritems({'family_name':1, 'subfamily_name':2, 'full_name':4,
-            'preferred_family_name':16, 'preferred_subfamily_name':17,
-            'wws_family_name':21, 'wws_subfamily_name':22}):
+    for name, num in {'family_name': 1, 'subfamily_name': 2, 'full_name': 4,
+                      'preferred_family_name': 16,
+                      'preferred_subfamily_name': 17, 'wws_family_name': 21,
+                      'wws_subfamily_name': 22}.items():
         try:
             ans[name] = decode_name_record(records[num])
         except (IndexError, KeyError, ValueError):
diff --git a/ebook_converter/utils/formatter_functions.py b/ebook_converter/utils/formatter_functions.py
index 37dbcbd..3fc7f9d 100644
--- a/ebook_converter/utils/formatter_functions.py
+++ b/ebook_converter/utils/formatter_functions.py
@@ -14,7 +14,6 @@ from ebook_converter.utils.titlecase import titlecase
 from ebook_converter.utils.icu import capitalize, strcmp, sort_key
 from ebook_converter.utils.date import parse_date, format_date, now, UNDEFINED_DATE
 from ebook_converter.utils.localization import calibre_langcode_to_name, canonicalize_lang
-from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
@@ -60,7 +59,7 @@ class FormatterFunctions(object):
         self._register_functions()
 
     def _register_functions(self):
-        for compiled_funcs in itervalues(self._functions_from_library):
+        for compiled_funcs in self._functions_from_library.values():
             for cls in compiled_funcs:
                 f = self._functions.get(cls.name, None)
                 replace = False
@@ -90,7 +89,7 @@ class FormatterFunctions(object):
 
     def get_builtins_and_aliases(self):
         res = {}
-        for f in itervalues(self._builtins):
+        for f in self._builtins.values():
             res[f.name] = f
             for a in f.aliases:
                 res[a] = f
@@ -834,7 +833,7 @@ class BuiltinFormatsSizes(BuiltinFormatterFunction):
     def evaluate(self, formatter, kwargs, mi, locals):
         fmt_data = mi.get('format_metadata', {})
         try:
-            return ','.join(k.upper()+':'+str(v['size']) for k,v in iteritems(fmt_data))
+            return ','.join(k.upper()+':'+str(v['size']) for k,v in fmt_data.items())
         except:
             return ''
 
@@ -853,7 +852,7 @@ class BuiltinFormatsPaths(BuiltinFormatterFunction):
     def evaluate(self, formatter, kwargs, mi, locals):
         fmt_data = mi.get('format_metadata', {})
         try:
-            return ','.join(k.upper()+':'+str(v['path']) for k,v in iteritems(fmt_data))
+            return ','.join(k.upper()+':'+str(v['path']) for k,v in fmt_data.items())
         except:
             return ''
 
@@ -1530,7 +1529,7 @@ class BuiltinUserCategories(BuiltinFormatterFunction):
 
     def evaluate(self, formatter, kwargs, mi, locals_):
         if hasattr(mi, '_proxy_metadata'):
-            cats = set(k for k, v in iteritems(mi._proxy_metadata.user_categories) if v)
+            cats = set(k for k, v in mi._proxy_metadata.user_categories.items() if v)
             cats = sorted(cats, key=sort_key)
             return ', '.join(cats)
         return _('This function can be used only in the GUI')
diff --git a/ebook_converter/utils/ipc/launch.py b/ebook_converter/utils/ipc/launch.py
index bb0bf87..0679788 100644
--- a/ebook_converter/utils/ipc/launch.py
+++ b/ebook_converter/utils/ipc/launch.py
@@ -5,7 +5,7 @@ from ebook_converter.constants import isosx, isfrozen, filesystem_encoding, ispy
 from ebook_converter.utils.config import prefs
 from ebook_converter.ptempfile import PersistentTemporaryFile, base_dir
 from ebook_converter.utils.serialize import msgpack_dumps
-from ebook_converter.polyglot.builtins import iteritems, environ_item, native_string_type
+from ebook_converter.polyglot.builtins import environ_item, native_string_type
 from ebook_converter.polyglot.binary import as_hex_unicode
 try:
     import win32process
@@ -162,7 +162,7 @@ class Worker(object):
             self._env = env.copy()
         else:
             # Windows cannot handle unicode env vars
-            for k, v in iteritems(env):
+            for k, v in env.items():
                 try:
                     if isinstance(k, str):
                         k = k.encode('ascii')
diff --git a/ebook_converter/utils/localization.py b/ebook_converter/utils/localization.py
index baa0b5c..4f6b74d 100644
--- a/ebook_converter/utils/localization.py
+++ b/ebook_converter/utils/localization.py
@@ -7,8 +7,6 @@ import json
 from gettext import GNUTranslations, NullTranslations
 import pkg_resources
 
-from ebook_converter.polyglot.builtins import iteritems
-
 _available_translations = None
 
 
@@ -284,7 +282,7 @@ def lang_map():
     translate = _
     global _lang_map
     if _lang_map is None:
-        _lang_map = {k:translate(v) for k, v in iteritems(iso639['by_3'])}
+        _lang_map = {k:translate(v) for k, v in iso639['by_3'].items()}
     return _lang_map
 
 
@@ -308,7 +306,7 @@ def langnames_to_langcodes(names):
     translate = _
     ans = {}
     names = set(names)
-    for k, v in iteritems(iso639['by_3']):
+    for k, v in iso639['by_3'].items():
         tv = translate(v)
         if tv in names:
             names.remove(tv)
diff --git a/ebook_converter/utils/localunzip.py b/ebook_converter/utils/localunzip.py
index db39480..548bd0e 100644
--- a/ebook_converter/utils/localunzip.py
+++ b/ebook_converter/utils/localunzip.py
@@ -9,8 +9,6 @@ from struct import calcsize, unpack, pack
 from collections import namedtuple, OrderedDict
 from tempfile import SpooledTemporaryFile
 
-from ebook_converter.polyglot.builtins import itervalues
-
 
 __license__ = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
@@ -311,7 +309,7 @@ class LocalZipFile(object):
 
         with SpooledTemporaryFile(max_size=100*1024*1024) as temp:
             ztemp = ZipFile(temp, 'w')
-            for offset, header in itervalues(self.file_info):
+            for offset, header in self.file_info.values():
                 if header.filename in names:
                     zi = ZipInfo(header.filename)
                     zi.compress_type = header.compression_method
diff --git a/ebook_converter/utils/logging.py b/ebook_converter/utils/logging.py
index 1bc1054..58c676c 100644
--- a/ebook_converter/utils/logging.py
+++ b/ebook_converter/utils/logging.py
@@ -6,7 +6,6 @@ from functools import partial
 from threading import Lock
 
 from ebook_converter import isbytestring, force_unicode, as_unicode, prints
-from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL 3'
@@ -88,7 +87,7 @@ class HTMLStream(Stream):
 
 class UnicodeHTMLStream(HTMLStream):
 
-    color = {k: v.decode('ascii') for k, v in iteritems(HTMLStream.color)}
+    color = {k: v.decode('ascii') for k, v in HTMLStream.color.items()}
     normal = HTMLStream.normal.decode('ascii')
 
     def __init__(self):
diff --git a/ebook_converter/utils/terminal.py b/ebook_converter/utils/terminal.py
index 682564f..7ec0e54 100644
--- a/ebook_converter/utils/terminal.py
+++ b/ebook_converter/utils/terminal.py
@@ -7,7 +7,7 @@ except ValueError:
     iswindows = False
 
 from ebook_converter.constants import ispy3
-from ebook_converter.polyglot.builtins import iteritems, native_string_type
+from ebook_converter.polyglot.builtins import native_string_type
 
 
 __license__ = 'GPL v3'
@@ -42,7 +42,7 @@ RATTRIBUTES = dict(
             'concealed'
             )
         ))
-ATTRIBUTES = {v:fmt(k) for k, v in iteritems(RATTRIBUTES)}
+ATTRIBUTES = {v:fmt(k) for k, v in RATTRIBUTES.items()}
 del ATTRIBUTES['']
 
 RBACKGROUNDS = dict(
@@ -56,7 +56,7 @@ RBACKGROUNDS = dict(
             'white'
             ),
     ))
-BACKGROUNDS = {v:fmt(k) for k, v in iteritems(RBACKGROUNDS)}
+BACKGROUNDS = {v:fmt(k) for k, v in RBACKGROUNDS.items()}
 
 RCOLORS = dict(
         zip(range(31, 38), (
@@ -69,7 +69,7 @@ RCOLORS = dict(
             'white',
             ),
         ))
-COLORS = {v:fmt(k) for k, v in iteritems(RCOLORS)}
+COLORS = {v:fmt(k) for k, v in RCOLORS.items()}
 
 RESET = fmt(0)