diff --git a/ebook_converter/__init__.py b/ebook_converter/__init__.py
index 6293aeb..0d71742 100644
--- a/ebook_converter/__init__.py
+++ b/ebook_converter/__init__.py
@@ -5,7 +5,7 @@ __docformat__ = 'restructuredtext en'
 
 import sys, os, re, time, random, warnings
 import pkg_resources
-from ebook_converter.polyglot.builtins import codepoint_to_chr, unicode_type, range, hasenv, native_string_type
+from ebook_converter.polyglot.builtins import codepoint_to_chr, unicode_type, hasenv, native_string_type
 from math import floor
 from functools import partial
 
diff --git a/ebook_converter/constants.py b/ebook_converter/constants.py
index 646f56d..945420e 100644
--- a/ebook_converter/constants.py
+++ b/ebook_converter/constants.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python2
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from ebook_converter.polyglot.builtins import map, unicode_type, environ_item, hasenv, getenv, as_unicode, native_string_type
+from ebook_converter.polyglot.builtins import unicode_type, environ_item, hasenv, getenv, as_unicode, native_string_type
 import sys, locale, codecs, os, importlib, collections
 
 __appname__   = 'calibre'
diff --git a/ebook_converter/css_selectors/parser.py b/ebook_converter/css_selectors/parser.py
index 1a1dc90..9a623a6 100644
--- a/ebook_converter/css_selectors/parser.py
+++ b/ebook_converter/css_selectors/parser.py
@@ -15,7 +15,7 @@ import operator
 import string
 
 from ebook_converter.css_selectors.errors import SelectorSyntaxError, ExpressionError
-from ebook_converter.polyglot.builtins import unicode_type, codepoint_to_chr, range
+from ebook_converter.polyglot.builtins import unicode_type, codepoint_to_chr
 
 
 utab = {c:c+32 for c in range(ord(u'A'), ord(u'Z')+1)}
diff --git a/ebook_converter/customize/profiles.py b/ebook_converter/customize/profiles.py
index a277e86..cfde21a 100644
--- a/ebook_converter/customize/profiles.py
+++ b/ebook_converter/customize/profiles.py
@@ -1,5 +1,5 @@
 from ebook_converter.customize import Plugin as _Plugin
-from ebook_converter.polyglot.builtins import zip
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/ebook_converter/customize/zipplugin.py b/ebook_converter/customize/zipplugin.py
index 6a4b729..1bb5208 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, map, string_or_bytes,
+from ebook_converter.polyglot.builtins import (itervalues, string_or_bytes,
         unicode_type, reload)
 
 
diff --git a/ebook_converter/ebooks/BeautifulSoup.py b/ebook_converter/ebooks/BeautifulSoup.py
index 31af905..fa65ad9 100644
--- a/ebook_converter/ebooks/BeautifulSoup.py
+++ b/ebook_converter/ebooks/BeautifulSoup.py
@@ -1,24 +1,20 @@
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 import bs4
-from bs4 import (  # noqa
-    CData, Comment, Declaration, NavigableString, ProcessingInstruction,
-    SoupStrainer, Tag, __version__
-)
+from html5_parser import soup as html5_soup
 
-from ebook_converter.polyglot.builtins import unicode_type
+from ebook_converter.ebooks import chardet
+from ebook_converter.utils import cleantext
 
 
 def parse_html(markup):
-    from ebook_converter.ebooks.chardet import strip_encoding_declarations, xml_to_unicode, substitute_entites
-    from ebook_converter.utils.cleantext import clean_xml_chars
-    if isinstance(markup, unicode_type):
-        markup = strip_encoding_declarations(markup)
-        markup = substitute_entites(markup)
+    if isinstance(markup, str):
+        markup = chardet.strip_encoding_declarations(markup)
+        markup = chardet.substitute_entites(markup)
     else:
-        markup = xml_to_unicode(markup, strip_encoding_pats=True, resolve_entities=True)[0]
-    markup = clean_xml_chars(markup)
-    from html5_parser.soup import parse
-    return parse(markup, return_root=False)
+        markup = chardet.xml_to_unicode(markup, strip_encoding_pats=True,
+                                        resolve_entities=True)[0]
+    markup = cleantext.clean_xml_chars(markup)
+    return html5_soup.parse(markup, return_root=False)
 
 
 def prettify(soup):
@@ -28,9 +24,9 @@ def prettify(soup):
     return ans
 
 
-def BeautifulSoup(markup='', *a, **kw):
+def html5_parser(markup='', *a, **kw):
     return parse_html(markup)
 
 
-def BeautifulStoneSoup(markup='', *a, **kw):
+def beautiful_soup_parser(markup='', *a, **kw):
     return bs4.BeautifulSoup(markup, 'xml')
diff --git a/ebook_converter/ebooks/compression/palmdoc.py b/ebook_converter/ebooks/compression/palmdoc.py
index 5ae51d5..d15452e 100644
--- a/ebook_converter/ebooks/compression/palmdoc.py
+++ b/ebook_converter/ebooks/compression/palmdoc.py
@@ -2,7 +2,6 @@ import io
 from struct import pack
 
 from ebook_converter.ebooks.compression import cPalmdoc
-from ebook_converter.polyglot.builtins import range
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/conversion/plugins/comic_input.py b/ebook_converter/ebooks/conversion/plugins/comic_input.py
index 7322c06..17c08e8 100644
--- a/ebook_converter/ebooks/conversion/plugins/comic_input.py
+++ b/ebook_converter/ebooks/conversion/plugins/comic_input.py
@@ -6,7 +6,7 @@ import shutil, textwrap, codecs, os
 from ebook_converter.customize.conversion import InputFormatPlugin, OptionRecommendation
 from ebook_converter import CurrentDir
 from ebook_converter.ptempfile import PersistentTemporaryDirectory
-from ebook_converter.polyglot.builtins import getcwd, map
+from ebook_converter.polyglot.builtins import getcwd
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/conversion/plugins/epub_output.py b/ebook_converter/ebooks/conversion/plugins/epub_output.py
index 48da2a0..b9674d8 100644
--- a/ebook_converter/ebooks/conversion/plugins/epub_output.py
+++ b/ebook_converter/ebooks/conversion/plugins/epub_output.py
@@ -4,7 +4,7 @@ from ebook_converter.customize.conversion import (OutputFormatPlugin,
         OptionRecommendation)
 from ebook_converter.ptempfile import TemporaryDirectory
 from ebook_converter import CurrentDir
-from ebook_converter.polyglot.builtins import unicode_type, filter, map, zip, range, as_bytes
+from ebook_converter.polyglot.builtins import unicode_type, as_bytes
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/conversion/plugins/html_input.py b/ebook_converter/ebooks/conversion/plugins/html_input.py
index f796163..cc76395 100644
--- a/ebook_converter/ebooks/conversion/plugins/html_input.py
+++ b/ebook_converter/ebooks/conversion/plugins/html_input.py
@@ -7,7 +7,7 @@ from ebook_converter.customize.conversion import (InputFormatPlugin,
 from ebook_converter.utils.localization import get_lang
 from ebook_converter.utils.filenames import ascii_filename
 from ebook_converter.utils.imghdr import what
-from ebook_converter.polyglot.builtins import unicode_type, zip, getcwd, as_unicode
+from ebook_converter.polyglot.builtins import unicode_type, getcwd, as_unicode
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/conversion/plugins/rtf_input.py b/ebook_converter/ebooks/conversion/plugins/rtf_input.py
index deb6527..605fb28 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, filter, getcwd, as_bytes
+from ebook_converter.polyglot.builtins import iteritems, getcwd, as_bytes
 
 __license__ = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/ebook_converter/ebooks/conversion/plumber.py b/ebook_converter/ebooks/conversion/plumber.py
index c2d6a57..ec56d13 100644
--- a/ebook_converter/ebooks/conversion/plumber.py
+++ b/ebook_converter/ebooks/conversion/plumber.py
@@ -13,7 +13,7 @@ from ebook_converter.utils.zipfile import ZipFile
 from ebook_converter import (extract, walk, isbytestring, filesystem_encoding,
         get_types_map)
 from ebook_converter.constants import __version__
-from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes, map
+from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes
 
 
 __license__ = 'GPL 3'
diff --git a/ebook_converter/ebooks/conversion/preprocess.py b/ebook_converter/ebooks/conversion/preprocess.py
index cc66b5b..1e528dd 100644
--- a/ebook_converter/ebooks/conversion/preprocess.py
+++ b/ebook_converter/ebooks/conversion/preprocess.py
@@ -2,7 +2,7 @@ import functools, re, json
 from math import ceil
 
 from ebook_converter import entity_to_unicode, as_unicode
-from ebook_converter.polyglot.builtins import unicode_type, range
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/covers.py b/ebook_converter/ebooks/covers.py
index f7eac3a..8de7cd2 100644
--- a/ebook_converter/ebooks/covers.py
+++ b/ebook_converter/ebooks/covers.py
@@ -2,7 +2,7 @@ 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, map, zip, string_or_bytes
+from ebook_converter.polyglot.builtins import iteritems, itervalues, string_or_bytes
 from itertools import chain
 
 from PyQt5.Qt import (
diff --git a/ebook_converter/ebooks/docx/cleanup.py b/ebook_converter/ebooks/docx/cleanup.py
index f4779c7..4e3a504 100644
--- a/ebook_converter/ebooks/docx/cleanup.py
+++ b/ebook_converter/ebooks/docx/cleanup.py
@@ -1,5 +1,5 @@
 import os
-from ebook_converter.polyglot.builtins import itervalues, range
+from ebook_converter.polyglot.builtins import itervalues
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/fonts.py b/ebook_converter/ebooks/docx/fonts.py
index ee6f0e9..7dba9e1 100644
--- a/ebook_converter/ebooks/docx/fonts.py
+++ b/ebook_converter/ebooks/docx/fonts.py
@@ -6,7 +6,7 @@ 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 codepoint_to_chr, iteritems, range
+from ebook_converter.polyglot.builtins import codepoint_to_chr, iteritems
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/index.py b/ebook_converter/ebooks/docx/index.py
index 652c757..92cc092 100644
--- a/ebook_converter/ebooks/docx/index.py
+++ b/ebook_converter/ebooks/docx/index.py
@@ -3,7 +3,7 @@ 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, filter
+from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/tables.py b/ebook_converter/ebooks/docx/tables.py
index 54a32e8..cb778fa 100644
--- a/ebook_converter/ebooks/docx/tables.py
+++ b/ebook_converter/ebooks/docx/tables.py
@@ -2,7 +2,7 @@ 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 filter, iteritems, itervalues, range, unicode_type
+from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/to_html.py b/ebook_converter/ebooks/docx/to_html.py
index 4985dc5..68d28f3 100644
--- a/ebook_converter/ebooks/docx/to_html.py
+++ b/ebook_converter/ebooks/docx/to_html.py
@@ -21,7 +21,7 @@ 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, filter, getcwd, map, unicode_type
+from ebook_converter.polyglot.builtins import iteritems, itervalues, getcwd, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/toc.py b/ebook_converter/ebooks/docx/toc.py
index 2e4fa89..dc517ee 100644
--- a/ebook_converter/ebooks/docx/toc.py
+++ b/ebook_converter/ebooks/docx/toc.py
@@ -5,7 +5,7 @@ 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, range
+from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/writer/container.py b/ebook_converter/ebooks/docx/writer/container.py
index 1f062fb..d4b4b71 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, map, unicode_type, native_string_type
+from ebook_converter.polyglot.builtins import iteritems, unicode_type, native_string_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/writer/fonts.py b/ebook_converter/ebooks/docx/writer/fonts.py
index b4fc217..27cdf0a 100644
--- a/ebook_converter/ebooks/docx/writer/fonts.py
+++ b/ebook_converter/ebooks/docx/writer/fonts.py
@@ -3,7 +3,6 @@ from uuid import uuid4
 
 from ebook_converter.ebooks.oeb.base import OEB_STYLES
 from ebook_converter.ebooks.oeb.transforms.subset import find_font_face_rules
-from ebook_converter.polyglot.builtins import range
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/docx/writer/images.py b/ebook_converter/ebooks/docx/writer/images.py
index 3488ff7..90da7c2 100644
--- a/ebook_converter/ebooks/docx/writer/images.py
+++ b/ebook_converter/ebooks/docx/writer/images.py
@@ -2,7 +2,7 @@ import os
 import posixpath
 from collections import namedtuple
 from functools import partial
-from ebook_converter.polyglot.builtins import iteritems, itervalues, map, unicode_type
+from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type
 
 from lxml import etree
 
diff --git a/ebook_converter/ebooks/docx/writer/styles.py b/ebook_converter/ebooks/docx/writer/styles.py
index e171b83..8b414ee 100644
--- a/ebook_converter/ebooks/docx/writer/styles.py
+++ b/ebook_converter/ebooks/docx/writer/styles.py
@@ -7,7 +7,7 @@ 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, filter, unicode_type
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 from ebook_converter.tinycss.css21 import CSS21Parser
 
 
diff --git a/ebook_converter/ebooks/docx/writer/tables.py b/ebook_converter/ebooks/docx/writer/tables.py
index a4e3912..f38a2c1 100644
--- a/ebook_converter/ebooks/docx/writer/tables.py
+++ b/ebook_converter/ebooks/docx/writer/tables.py
@@ -2,7 +2,7 @@ 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, range, unicode_type
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/fb2/fb2ml.py b/ebook_converter/ebooks/fb2/fb2ml.py
index b163533..590d13b 100644
--- a/ebook_converter/ebooks/fb2/fb2ml.py
+++ b/ebook_converter/ebooks/fb2/fb2ml.py
@@ -12,7 +12,7 @@ from ebook_converter.utils.localization import lang_as_iso639_1
 from ebook_converter.utils.xml_parse import safe_xml_fromstring
 from ebook_converter.utils.img import save_cover_data_to
 from ebook_converter.ebooks.oeb.base import urlnormalize
-from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes, range, filter
+from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes
 from ebook_converter.polyglot.binary import as_base64_unicode
 from ebook_converter.polyglot.urllib import urlparse
 
diff --git a/ebook_converter/ebooks/lrf/html/convert_from.py b/ebook_converter/ebooks/lrf/html/convert_from.py
index ff6b1dc..89ee036 100644
--- a/ebook_converter/ebooks/lrf/html/convert_from.py
+++ b/ebook_converter/ebooks/lrf/html/convert_from.py
@@ -17,15 +17,15 @@ from functools import partial
 from itertools import chain
 from math import ceil, floor
 
+import bs4
+
 from ebook_converter import (
     __appname__, entity_to_unicode, fit_image, force_unicode, preferred_encoding
 )
 from ebook_converter.constants import filesystem_encoding
 from ebook_converter.devices.interface import DevicePlugin as Device
 from ebook_converter.ebooks import ConversionError
-from ebook_converter.ebooks.BeautifulSoup import (
-    BeautifulSoup, Comment, Declaration, NavigableString, ProcessingInstruction, Tag
-)
+from ebook_converter.ebooks.BeautifulSoup import html5_parser
 from ebook_converter.ebooks.chardet import xml_to_unicode
 from ebook_converter.ebooks.lrf import Book
 from ebook_converter.ebooks.lrf.html.color_map import lrs_color
@@ -86,7 +86,7 @@ def tag_regex(tagname):
 class HTMLConverter(object):
     SELECTOR_PAT   = re.compile(r"([A-Za-z0-9\-\_\:\.]+[A-Za-z0-9\-\_\:\.\s\,]*)\s*\{([^\}]*)\}")
     PAGE_BREAK_PAT = re.compile(r'page-break-(?:after|before)\s*:\s*(\w+)', re.IGNORECASE)
-    IGNORED_TAGS   = (Comment, Declaration, ProcessingInstruction)
+    IGNORED_TAGS   = (bs4.Comment, bs4.Declaration, bs4.ProcessingInstruction)
 
     MARKUP_MASSAGE   = [
                         # Close <a /> tags
@@ -337,7 +337,7 @@ class HTMLConverter(object):
             raw = xml_to_unicode(raw, replace_entities=True)[0]
         for pat, repl in nmassage:
             raw = pat.sub(repl, raw)
-        soup = BeautifulSoup(raw)
+        soup = html5_parser(raw)
         if not self.baen and self.is_baen(soup):
             self.baen = True
             self.log.info(_('\tBaen file detected. Re-parsing...'))
@@ -585,9 +585,9 @@ class HTMLConverter(object):
                 break
             if isinstance(c, HTMLConverter.IGNORED_TAGS):
                 continue
-            if isinstance(c, NavigableString):
+            if isinstance(c, bs4.NavigableString):
                 text += unicode_type(c)
-            elif isinstance(c, Tag):
+            elif isinstance(c, bs4.Tag):
                 if c.name.lower() == 'img' and c.has_attr('alt'):
                     alt_text += c['alt']
                     continue
@@ -720,9 +720,9 @@ class HTMLConverter(object):
         for c in copy.copy(ptag.contents):
             if isinstance(c, HTMLConverter.IGNORED_TAGS):
                 continue
-            elif isinstance(c, Tag):
+            elif isinstance(c, bs4.Tag):
                 self.parse_tag(c, pcss)
-            elif isinstance(c, NavigableString):
+            elif isinstance(c, bs4.NavigableString):
                 self.add_text(c, pcss, ppcss)
         if not self.in_table:
             try:
@@ -1551,11 +1551,11 @@ class HTMLConverter(object):
 
                 if tag.contents:
                     c = tag.contents[0]
-                    if isinstance(c, NavigableString):
+                    if isinstance(c, bs4.NavigableString):
                         c = unicode_type(c).replace('\r\n', '\n').replace('\r', '\n')
                         if c.startswith('\n'):
                             c = c[1:]
-                            tag.contents[0] = NavigableString(c)
+                            tag.contents[0] = bs4.NavigableString(c)
                             tag.contents[0].setup(tag)
                 self.process_children(tag, tag_css, tag_pseudo_css)
                 self.end_current_block()
@@ -1823,7 +1823,7 @@ def process_file(path, options, logger):
     for prop in ('author', 'author_sort', 'title', 'title_sort', 'publisher', 'freetext'):
         val = getattr(options, prop, None)
         if val and not isinstance(val, unicode_type):
-            soup = BeautifulSoup(val)
+            soup = html5_parser(val)
             setattr(options, prop, unicode_type(soup))
 
     title = (options.title, options.title_sort)
diff --git a/ebook_converter/ebooks/lrf/html/table.py b/ebook_converter/ebooks/lrf/html/table.py
index 05a27ed..a698f50 100644
--- a/ebook_converter/ebooks/lrf/html/table.py
+++ b/ebook_converter/ebooks/lrf/html/table.py
@@ -4,7 +4,7 @@ from ebook_converter.ebooks.lrf.fonts import get_font
 from ebook_converter.ebooks.lrf.pylrs.pylrs import TextBlock, Text, CR, Span, \
                                              CharButton, Plot, Paragraph, \
                                              LrsTextTag
-from ebook_converter.polyglot.builtins import string_or_bytes, range, native_string_type
+from ebook_converter.polyglot.builtins import string_or_bytes, native_string_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/metadata/__init__.py b/ebook_converter/ebooks/metadata/__init__.py
index b7a3187..5d3648d 100644
--- a/ebook_converter/ebooks/metadata/__init__.py
+++ b/ebook_converter/ebooks/metadata/__init__.py
@@ -6,7 +6,7 @@ import os, sys, re
 
 from ebook_converter import relpath, guess_type, prints, force_unicode
 from ebook_converter.utils.config_base import tweaks
-from ebook_converter.polyglot.builtins import codepoint_to_chr, unicode_type, range, map, zip, getcwd, iteritems, itervalues, as_unicode
+from ebook_converter.polyglot.builtins import codepoint_to_chr, unicode_type, getcwd, iteritems, itervalues, as_unicode
 from ebook_converter.polyglot.urllib import quote, unquote, urlparse
 
 
diff --git a/ebook_converter/ebooks/metadata/archive.py b/ebook_converter/ebooks/metadata/archive.py
index 655f8c6..1c750ba 100644
--- a/ebook_converter/ebooks/metadata/archive.py
+++ b/ebook_converter/ebooks/metadata/archive.py
@@ -3,7 +3,7 @@ from contextlib import closing
 
 from ebook_converter.customize import FileTypePlugin
 from ebook_converter.utils.localization import canonicalize_lang
-from ebook_converter.polyglot.builtins import filter, unicode_type
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/metadata/book/base.py b/ebook_converter/ebooks/metadata/book/base.py
index 372c68f..9018432 100644
--- a/ebook_converter/ebooks/metadata/book/base.py
+++ b/ebook_converter/ebooks/metadata/book/base.py
@@ -7,7 +7,7 @@ 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, unicode_type, filter, map
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/metadata/opf2.py b/ebook_converter/ebooks/metadata/opf2.py
index 453d2e1..e3d8f48 100644
--- a/ebook_converter/ebooks/metadata/opf2.py
+++ b/ebook_converter/ebooks/metadata/opf2.py
@@ -17,7 +17,7 @@ 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, unicode_type, getcwd, map
+from ebook_converter.polyglot.builtins import iteritems, unicode_type, getcwd
 from ebook_converter.polyglot.urllib import unquote, urlparse
 
 
diff --git a/ebook_converter/ebooks/metadata/opf3.py b/ebook_converter/ebooks/metadata/opf3.py
index f9f62dd..6a03967 100644
--- a/ebook_converter/ebooks/metadata/opf3.py
+++ b/ebook_converter/ebooks/metadata/opf3.py
@@ -2,7 +2,7 @@ import json
 import re
 from collections import defaultdict, namedtuple
 from functools import wraps
-from ebook_converter.polyglot.builtins import iteritems, map, filter
+from ebook_converter.polyglot.builtins import iteritems
 
 from lxml import etree
 
diff --git a/ebook_converter/ebooks/metadata/rtf.py b/ebook_converter/ebooks/metadata/rtf.py
index a23f148..a2868e7 100644
--- a/ebook_converter/ebooks/metadata/rtf.py
+++ b/ebook_converter/ebooks/metadata/rtf.py
@@ -6,7 +6,7 @@ import re
 
 from ebook_converter import force_unicode
 from ebook_converter.ebooks.metadata import MetaInformation
-from ebook_converter.polyglot.builtins import codepoint_to_chr, string_or_bytes, unicode_type, int_to_byte, filter
+from ebook_converter.polyglot.builtins import codepoint_to_chr, string_or_bytes, unicode_type, int_to_byte
 
 title_pat    = re.compile(br'\{\\info.*?\{\\title(.*?)(?<!\\)\}', re.DOTALL)
 author_pat   = re.compile(br'\{\\info.*?\{\\author(.*?)(?<!\\)\}', re.DOTALL)
diff --git a/ebook_converter/ebooks/metadata/utils.py b/ebook_converter/ebooks/metadata/utils.py
index a814d38..0fbce09 100644
--- a/ebook_converter/ebooks/metadata/utils.py
+++ b/ebook_converter/ebooks/metadata/utils.py
@@ -7,7 +7,6 @@ from ebook_converter.spell import parse_lang_code
 from ebook_converter.utils.cleantext import clean_xml_chars
 from ebook_converter.utils.localization import lang_as_iso639_1
 from ebook_converter.utils.xml_parse import safe_xml_fromstring
-from ebook_converter.polyglot.builtins import filter, map
 
 
 OPFVersion = namedtuple('OPFVersion', 'major minor patch')
diff --git a/ebook_converter/ebooks/metadata/xmp.py b/ebook_converter/ebooks/metadata/xmp.py
index 5e02c28..d1a04eb 100644
--- a/ebook_converter/ebooks/metadata/xmp.py
+++ b/ebook_converter/ebooks/metadata/xmp.py
@@ -12,7 +12,7 @@ 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, string_or_bytes, filter
+from ebook_converter.polyglot.builtins import iteritems, string_or_bytes
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/mobi/huffcdic.py b/ebook_converter/ebooks/mobi/huffcdic.py
index 24f9ea8..13d71fd 100644
--- a/ebook_converter/ebooks/mobi/huffcdic.py
+++ b/ebook_converter/ebooks/mobi/huffcdic.py
@@ -5,7 +5,6 @@ darkninja and igorsk.
 import struct
 
 from ebook_converter.ebooks.mobi import MobiError
-from ebook_converter.polyglot.builtins import map
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/mobi/reader/index.py b/ebook_converter/ebooks/mobi/reader/index.py
index f1e358f..d9b70f4 100644
--- a/ebook_converter/ebooks/mobi/reader/index.py
+++ b/ebook_converter/ebooks/mobi/reader/index.py
@@ -3,7 +3,7 @@ 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, range, zip
+from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/mobi/reader/markup.py b/ebook_converter/ebooks/mobi/reader/markup.py
index c9ca26a..54af43e 100644
--- a/ebook_converter/ebooks/mobi/reader/markup.py
+++ b/ebook_converter/ebooks/mobi/reader/markup.py
@@ -1,7 +1,7 @@
 import re, os
 
 from ebook_converter.ebooks.chardet import strip_encoding_declarations
-from ebook_converter.polyglot.builtins import unicode_type, range
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/mobi/reader/mobi6.py b/ebook_converter/ebooks/mobi/reader/mobi6.py
index abf70da..7e9e2f2 100644
--- a/ebook_converter/ebooks/mobi/reader/mobi6.py
+++ b/ebook_converter/ebooks/mobi/reader/mobi6.py
@@ -16,7 +16,7 @@ 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, unicode_type, range, map
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/mobi/reader/mobi8.py b/ebook_converter/ebooks/mobi/reader/mobi8.py
index 2b68d42..25f353f 100644
--- a/ebook_converter/ebooks/mobi/reader/mobi8.py
+++ b/ebook_converter/ebooks/mobi/reader/mobi8.py
@@ -15,7 +15,7 @@ from ebook_converter.ebooks.metadata.toc import TOC
 from ebook_converter.ebooks.mobi.utils import read_font_record
 from ebook_converter.ebooks.oeb.parse_utils import parse_html
 from ebook_converter.ebooks.oeb.base import XPath, XHTML, xml2text
-from ebook_converter.polyglot.builtins import range, zip, unicode_type, getcwd, as_unicode
+from ebook_converter.polyglot.builtins import unicode_type, getcwd, as_unicode
 from ebook_converter.polyglot.urllib import urldefrag
 
 
diff --git a/ebook_converter/ebooks/mobi/utils.py b/ebook_converter/ebooks/mobi/utils.py
index 573956e..f72ddde 100644
--- a/ebook_converter/ebooks/mobi/utils.py
+++ b/ebook_converter/ebooks/mobi/utils.py
@@ -5,7 +5,7 @@ from io import BytesIO
 from ebook_converter.utils.img import save_cover_data_to, scale_image, image_to_data, image_from_data, resize_image, png_data_to_gif_data
 from ebook_converter.utils.imghdr import what
 from ebook_converter.ebooks import normalize
-from ebook_converter.polyglot.builtins import unicode_type, range, as_bytes, map
+from ebook_converter.polyglot.builtins import unicode_type, as_bytes
 from ebook_converter.tinycss.color3 import parse_color_string
 
 
diff --git a/ebook_converter/ebooks/mobi/writer2/indexer.py b/ebook_converter/ebooks/mobi/writer2/indexer.py
index 04f8580..8550045 100644
--- a/ebook_converter/ebooks/mobi/writer2/indexer.py
+++ b/ebook_converter/ebooks/mobi/writer2/indexer.py
@@ -5,7 +5,7 @@ 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 filter, iteritems, itervalues, map, range
+from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/mobi/writer2/main.py b/ebook_converter/ebooks/mobi/writer2/main.py
index 2f9afb1..75af711 100644
--- a/ebook_converter/ebooks/mobi/writer2/main.py
+++ b/ebook_converter/ebooks/mobi/writer2/main.py
@@ -10,7 +10,7 @@ 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, unicode_type, range
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/odt/input.py b/ebook_converter/ebooks/odt/input.py
index 0f39a90..bccceb6 100644
--- a/ebook_converter/ebooks/odt/input.py
+++ b/ebook_converter/ebooks/odt/input.py
@@ -15,7 +15,7 @@ from odf.namespaces import TEXTNS as odTEXTNS
 from ebook_converter import CurrentDir, walk
 from ebook_converter.ebooks.oeb.base import _css_logger
 from ebook_converter.utils.xml_parse import safe_xml_fromstring
-from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes, filter, getcwd, as_bytes
+from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes, getcwd, as_bytes
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/oeb/base.py b/ebook_converter/ebooks/oeb/base.py
index 86f6ca9..e89f694 100644
--- a/ebook_converter/ebooks/oeb/base.py
+++ b/ebook_converter/ebooks/oeb/base.py
@@ -16,7 +16,7 @@ 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, unicode_type, string_or_bytes, range, itervalues, filter, codepoint_to_chr
+from ebook_converter.polyglot.builtins import iteritems, unicode_type, string_or_bytes, itervalues, codepoint_to_chr
 from ebook_converter.polyglot.urllib import unquote as urlunquote, urldefrag, urljoin, urlparse, urlunparse
 
 
diff --git a/ebook_converter/ebooks/oeb/normalize_css.py b/ebook_converter/ebooks/oeb/normalize_css.py
index debcc06..897e4f0 100644
--- a/ebook_converter/ebooks/oeb/normalize_css.py
+++ b/ebook_converter/ebooks/oeb/normalize_css.py
@@ -5,7 +5,7 @@ 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, string_or_bytes, unicode_type, zip
+from ebook_converter.polyglot.builtins import iteritems, string_or_bytes, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/oeb/parse_utils.py b/ebook_converter/ebooks/oeb/parse_utils.py
index 88ef54b..abbc0b7 100644
--- a/ebook_converter/ebooks/oeb/parse_utils.py
+++ b/ebook_converter/ebooks/oeb/parse_utils.py
@@ -6,7 +6,7 @@ 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, unicode_type, string_or_bytes, map
+from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type, string_or_bytes
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/oeb/polish/container.py b/ebook_converter/ebooks/oeb/polish/container.py
index 1ace749..0690658 100644
--- a/ebook_converter/ebooks/oeb/polish/container.py
+++ b/ebook_converter/ebooks/oeb/polish/container.py
@@ -48,7 +48,7 @@ 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, map, unicode_type, zip
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 from ebook_converter.polyglot.urllib import urlparse
 
 exists, join, relpath = os.path.exists, os.path.join, os.path.relpath
diff --git a/ebook_converter/ebooks/oeb/polish/css.py b/ebook_converter/ebooks/oeb/polish/css.py
index 1593cb2..99f2d0e 100644
--- a/ebook_converter/ebooks/oeb/polish/css.py
+++ b/ebook_converter/ebooks/oeb/polish/css.py
@@ -10,7 +10,7 @@ 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, unicode_type, filter
+from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/oeb/polish/pretty.py b/ebook_converter/ebooks/oeb/polish/pretty.py
index 34f6078..27e0868 100644
--- a/ebook_converter/ebooks/oeb/polish/pretty.py
+++ b/ebook_converter/ebooks/oeb/polish/pretty.py
@@ -1,5 +1,5 @@
 import textwrap
-from ebook_converter.polyglot.builtins import iteritems, map
+from ebook_converter.polyglot.builtins import iteritems
 
 # from lxml.etree import Element
 
diff --git a/ebook_converter/ebooks/oeb/polish/replace.py b/ebook_converter/ebooks/oeb/polish/replace.py
index 4eb0b32..af211e7 100644
--- a/ebook_converter/ebooks/oeb/polish/replace.py
+++ b/ebook_converter/ebooks/oeb/polish/replace.py
@@ -1,5 +1,5 @@
 import codecs, shutil, os, posixpath
-from ebook_converter.polyglot.builtins import iteritems, itervalues, map
+from ebook_converter.polyglot.builtins import iteritems, itervalues
 from functools import partial
 from collections import Counter, defaultdict
 
diff --git a/ebook_converter/ebooks/oeb/polish/split.py b/ebook_converter/ebooks/oeb/polish/split.py
index e3515d6..10fe9cd 100644
--- a/ebook_converter/ebooks/oeb/polish/split.py
+++ b/ebook_converter/ebooks/oeb/polish/split.py
@@ -1,5 +1,5 @@
 import copy, os, re
-from ebook_converter.polyglot.builtins import map, string_or_bytes, range
+from ebook_converter.polyglot.builtins import string_or_bytes
 
 from ebook_converter.ebooks.oeb.base import barename, XPNSMAP, XPath, OPF, XHTML, OEB_DOCS
 from ebook_converter.ebooks.oeb.polish.errors import MalformedMarkup
diff --git a/ebook_converter/ebooks/oeb/polish/toc.py b/ebook_converter/ebooks/oeb/polish/toc.py
index 70ba1ec..966368b 100644
--- a/ebook_converter/ebooks/oeb/polish/toc.py
+++ b/ebook_converter/ebooks/oeb/polish/toc.py
@@ -15,7 +15,7 @@ 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, map, unicode_type
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 from ebook_converter.polyglot.urllib import urlparse
 
 
diff --git a/ebook_converter/ebooks/oeb/polish/utils.py b/ebook_converter/ebooks/oeb/polish/utils.py
index 957c37d..e653d26 100644
--- a/ebook_converter/ebooks/oeb/polish/utils.py
+++ b/ebook_converter/ebooks/oeb/polish/utils.py
@@ -2,7 +2,6 @@ import re, os
 from bisect import bisect
 
 from ebook_converter import guess_type as _guess_type, replace_entities
-from ebook_converter.polyglot.builtins import filter
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/oeb/reader.py b/ebook_converter/ebooks/oeb/reader.py
index cc9515b..749efa1 100644
--- a/ebook_converter/ebooks/oeb/reader.py
+++ b/ebook_converter/ebooks/oeb/reader.py
@@ -22,7 +22,7 @@ from ebook_converter.utils.localization import get_lang
 from ebook_converter.ptempfile import TemporaryDirectory
 from ebook_converter.constants import __appname__, __version__
 from ebook_converter import guess_type, xml_replace_entities
-from ebook_converter.polyglot.builtins import unicode_type, zip
+from ebook_converter.polyglot.builtins import unicode_type
 from ebook_converter.polyglot.urllib import unquote, urldefrag, urlparse
 
 
diff --git a/ebook_converter/ebooks/oeb/stylizer.py b/ebook_converter/ebooks/oeb/stylizer.py
index 7e78f56..7edd780 100644
--- a/ebook_converter/ebooks/oeb/stylizer.py
+++ b/ebook_converter/ebooks/oeb/stylizer.py
@@ -15,7 +15,7 @@ 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, unicode_type, filter
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 from ebook_converter.tinycss.media3 import CSSMedia3Parser
 
 
diff --git a/ebook_converter/ebooks/oeb/transforms/flatcss.py b/ebook_converter/ebooks/oeb/transforms/flatcss.py
index 4655609..4a0734b 100644
--- a/ebook_converter/ebooks/oeb/transforms/flatcss.py
+++ b/ebook_converter/ebooks/oeb/transforms/flatcss.py
@@ -16,7 +16,7 @@ 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, unicode_type, string_or_bytes, map
+from ebook_converter.polyglot.builtins import iteritems, unicode_type, string_or_bytes
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/oeb/transforms/jacket.py b/ebook_converter/ebooks/oeb/transforms/jacket.py
index 7255817..eb4d0f9 100644
--- a/ebook_converter/ebooks/oeb/transforms/jacket.py
+++ b/ebook_converter/ebooks/oeb/transforms/jacket.py
@@ -10,7 +10,7 @@ from ebook_converter.library.comments import comments_to_html, markdown
 from ebook_converter.utils.date import is_date_undefined, as_local_time
 from ebook_converter.ebooks.chardet import strip_encoding_declarations
 from ebook_converter.ebooks.metadata import fmt_sidx, rating_to_stars
-from ebook_converter.polyglot.builtins import unicode_type, map
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/oeb/transforms/split.py b/ebook_converter/ebooks/oeb/transforms/split.py
index 3e21e28..c7d1d8a 100644
--- a/ebook_converter/ebooks/oeb/transforms/split.py
+++ b/ebook_converter/ebooks/oeb/transforms/split.py
@@ -14,7 +14,7 @@ from ebook_converter.ebooks.epub import rules
 from ebook_converter.ebooks.oeb.base import (OEB_STYLES, XPNSMAP as NAMESPACES,
         urldefrag, rewrite_links, XHTML, urlnormalize)
 from ebook_converter.ebooks.oeb.polish.split import do_split
-from ebook_converter.polyglot.builtins import iteritems, range, map, unicode_type
+from ebook_converter.polyglot.builtins import iteritems, unicode_type
 from ebook_converter.polyglot.urllib import unquote
 from ebook_converter.css_selectors import Select, SelectorError
 
diff --git a/ebook_converter/ebooks/oeb/transforms/subset.py b/ebook_converter/ebooks/oeb/transforms/subset.py
index 7511ce4..7b4d6d1 100644
--- a/ebook_converter/ebooks/oeb/transforms/subset.py
+++ b/ebook_converter/ebooks/oeb/transforms/subset.py
@@ -2,7 +2,7 @@ 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, unicode_type, range
+from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type
 from ebook_converter.tinycss.fonts3 import parse_font_family
 
 
diff --git a/ebook_converter/ebooks/pdb/ereader/reader132.py b/ebook_converter/ebooks/pdb/ereader/reader132.py
index 3c254b1..c37f3f8 100644
--- a/ebook_converter/ebooks/pdb/ereader/reader132.py
+++ b/ebook_converter/ebooks/pdb/ereader/reader132.py
@@ -11,7 +11,7 @@ from ebook_converter.ebooks import DRMError
 from ebook_converter.ebooks.metadata.opf2 import OPFCreator
 from ebook_converter.ebooks.pdb.ereader import EreaderError
 from ebook_converter.ebooks.pdb.formatreader import FormatReader
-from ebook_converter.polyglot.builtins import unicode_type, range
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/pdb/ereader/reader202.py b/ebook_converter/ebooks/pdb/ereader/reader202.py
index 0977c7f..a276c8f 100644
--- a/ebook_converter/ebooks/pdb/ereader/reader202.py
+++ b/ebook_converter/ebooks/pdb/ereader/reader202.py
@@ -9,7 +9,7 @@ from ebook_converter import CurrentDir
 from ebook_converter.ebooks.metadata.opf2 import OPFCreator
 from ebook_converter.ebooks.pdb.formatreader import FormatReader
 from ebook_converter.ebooks.pdb.ereader import EreaderError
-from ebook_converter.polyglot.builtins import unicode_type, range
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/pdb/haodoo/reader.py b/ebook_converter/ebooks/pdb/haodoo/reader.py
index 485313d..74e6a18 100644
--- a/ebook_converter/ebooks/pdb/haodoo/reader.py
+++ b/ebook_converter/ebooks/pdb/haodoo/reader.py
@@ -8,7 +8,6 @@ from ebook_converter import prepare_string_for_xml
 from ebook_converter.ebooks.pdb.formatreader import FormatReader
 from ebook_converter.ebooks.metadata import MetaInformation
 from ebook_converter.ebooks.txt.processor import opf_writer, HTML_TEMPLATE
-from ebook_converter.polyglot.builtins import range, map
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/pdb/pdf/reader.py b/ebook_converter/ebooks/pdb/pdf/reader.py
index f5196db..d60935a 100644
--- a/ebook_converter/ebooks/pdb/pdf/reader.py
+++ b/ebook_converter/ebooks/pdb/pdf/reader.py
@@ -3,7 +3,6 @@ Read content from palmdoc pdb file.
 """
 from ebook_converter.ebooks.pdb.formatreader import FormatReader
 from ebook_converter.ptempfile import PersistentTemporaryFile
-from ebook_converter.polyglot.builtins import range
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/pdb/plucker/reader.py b/ebook_converter/ebooks/pdb/plucker/reader.py
index 5ab2d6c..dcafeb2 100644
--- a/ebook_converter/ebooks/pdb/plucker/reader.py
+++ b/ebook_converter/ebooks/pdb/plucker/reader.py
@@ -9,7 +9,7 @@ from ebook_converter.ebooks.pdb.formatreader import FormatReader
 from ebook_converter.ebooks.compression.palmdoc import decompress_doc
 from ebook_converter.utils.imghdr import identify
 from ebook_converter.utils.img import save_cover_data_to, Canvas, image_from_data
-from ebook_converter.polyglot.builtins import codepoint_to_chr, range
+from ebook_converter.polyglot.builtins import codepoint_to_chr
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/ebooks/rtf2xml/tokenize.py b/ebook_converter/ebooks/rtf2xml/tokenize.py
index 615870b..95e731d 100644
--- a/ebook_converter/ebooks/rtf2xml/tokenize.py
+++ b/ebook_converter/ebooks/rtf2xml/tokenize.py
@@ -15,7 +15,7 @@ import os, re
 from ebook_converter.ebooks.rtf2xml import copy
 from ebook_converter.utils.mreplace import MReplace
 from ebook_converter.ptempfile import better_mktemp
-from ebook_converter.polyglot.builtins import codepoint_to_chr, range, filter, map
+from ebook_converter.polyglot.builtins import codepoint_to_chr
 from . import open_for_read, open_for_write
 
 
diff --git a/ebook_converter/ebooks/txt/processor.py b/ebook_converter/ebooks/txt/processor.py
index 5fe4344..19a9a30 100644
--- a/ebook_converter/ebooks/txt/processor.py
+++ b/ebook_converter/ebooks/txt/processor.py
@@ -8,7 +8,7 @@ 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, unicode_type, map, range, long_type
+from ebook_converter.polyglot.builtins import iteritems, unicode_type, long_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/library/__init__.py b/ebook_converter/library/__init__.py
index c0e2b1f..729a4b8 100644
--- a/ebook_converter/library/__init__.py
+++ b/ebook_converter/library/__init__.py
@@ -3,8 +3,6 @@ Code to manage ebook library
 """
 import os
 
-from ebook_converter.polyglot.builtins import range
-
 
 __license__ = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/ebook_converter/library/catalogs/bibtex.py b/ebook_converter/library/catalogs/bibtex.py
index d399cdb..1517296 100644
--- a/ebook_converter/library/catalogs/bibtex.py
+++ b/ebook_converter/library/catalogs/bibtex.py
@@ -6,7 +6,7 @@ from ebook_converter.customize import CatalogPlugin
 from ebook_converter.library.catalogs import FIELDS, TEMPLATE_ALLOWED_FIELDS
 from ebook_converter.customize.conversion import DummyReporter
 from ebook_converter.ebooks.metadata import format_isbn
-from ebook_converter.polyglot.builtins import filter, string_or_bytes, unicode_type
+from ebook_converter.polyglot.builtins import string_or_bytes, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/library/comments.py b/ebook_converter/library/comments.py
index dc6d1f9..bc31909 100644
--- a/ebook_converter/library/comments.py
+++ b/ebook_converter/library/comments.py
@@ -1,11 +1,10 @@
 import re
 
+import bs4
+
 from ebook_converter import prepare_string_for_xml
 from ebook_converter.constants import preferred_encoding
-from ebook_converter.ebooks.BeautifulSoup import (
-    BeautifulSoup, CData, Comment, Declaration, NavigableString,
-    ProcessingInstruction
-)
+from ebook_converter.ebooks.BeautifulSoup import html5_parser
 from ebook_converter.utils.html2text import html2text
 from ebook_converter.polyglot.builtins import unicode_type
 
@@ -83,8 +82,8 @@ def comments_to_html(comments):
     # Convert two hyphens to emdash
     comments = comments.replace('--', '&mdash;')
 
-    soup = BeautifulSoup('<div>' + comments + '</div>').find('div')
-    result = BeautifulSoup('<div>')
+    soup = html5_parser('<div>' + comments + '</div>').find('div')
+    result = html5_parser('<div>')
     container = result.find('div')
     rtc = 0
     open_pTag = False
@@ -92,9 +91,10 @@ def comments_to_html(comments):
     all_tokens = list(soup.contents)
     inline_tags = ('br', 'b', 'i', 'em', 'strong', 'span', 'font', 'a', 'hr')
     for token in all_tokens:
-        if isinstance(token,  (CData, Comment, Declaration, ProcessingInstruction)):
+        if isinstance(token, (bs4.CData, bs4.Comment, bs4.Declaration,
+                              bs4.ProcessingInstruction)):
             continue
-        if isinstance(token, NavigableString):
+        if isinstance(token, bs4.NavigableString):
             if not open_pTag:
                 pTag = result.new_tag('p')
                 open_pTag = True
diff --git a/ebook_converter/polyglot/builtins.py b/ebook_converter/polyglot/builtins.py
index 15dca35..30591b9 100644
--- a/ebook_converter/polyglot/builtins.py
+++ b/ebook_converter/polyglot/builtins.py
@@ -1,3 +1,4 @@
+import importlib
 import os
 import sys
 
@@ -32,153 +33,67 @@ def as_unicode(x, encoding='utf-8', errors='strict'):
     return unicode_type(x)
 
 
-def only_unicode_recursive(x, encoding='utf-8', errors='strict'):
-    # Convert any bytestrings in sets/lists/tuples/dicts to unicode
+def reraise(tp, value, tb=None):
+    try:
+        if value is None:
+            value = tp()
+        if value.__traceback__ is not tb:
+            raise value.with_traceback(tb)
+        raise value
+    finally:
+        value = None
+        tb = None
+
+
+codepoint_to_chr = chr
+unicode_type = str
+string_or_bytes = str, bytes
+string_or_unicode = str
+long_type = int
+raw_input = input
+getcwd = os.getcwd
+getenv = os.getenv
+
+
+def error_message(exc):
+    args = getattr(exc, 'args', None)
+    if args and isinstance(args[0], unicode_type):
+        return args[0]
+    return unicode_type(exc)
+
+
+def iteritems(d):
+    return iter(d.items())
+
+
+def itervalues(d):
+    return iter(d.values())
+
+
+def environ_item(x):
     if isinstance(x, bytes):
-        return x.decode(encoding, errors)
-    if isinstance(x, unicode_type):
-        return x
-    if isinstance(x, (set, list, tuple, frozenset)):
-        return type(x)(only_unicode_recursive(i, encoding, errors) for i in x)
-    if isinstance(x, dict):
-        return {only_unicode_recursive(k, encoding, errors): only_unicode_recursive(v, encoding, errors) for k, v in iteritems(x)}
+        x = x.decode('utf-8')
     return x
 
 
-if is_py3:
-    def reraise(tp, value, tb=None):
-        try:
-            if value is None:
-                value = tp()
-            if value.__traceback__ is not tb:
-                raise value.with_traceback(tb)
-            raise value
-        finally:
-            value = None
-            tb = None
+def exec_path(path, ctx=None):
+    ctx = ctx or {}
+    with open(path, 'rb') as f:
+        code = f.read()
+    code = compile(code, f.name, 'exec')
+    exec(code, ctx)
 
-    import builtins
 
-    zip = builtins.zip
-    map = builtins.map
-    filter = builtins.filter
-    range = builtins.range
+def cmp(a, b):
+    return (a > b) - (a < b)
 
-    codepoint_to_chr = chr
-    unicode_type = str
-    string_or_bytes = str, bytes
-    string_or_unicode = str
-    long_type = int
-    raw_input = input
-    getcwd = os.getcwd
-    getenv = os.getenv
 
-    def error_message(exc):
-        args = getattr(exc, 'args', None)
-        if args and isinstance(args[0], unicode_type):
-            return args[0]
-        return unicode_type(exc)
+def int_to_byte(x):
+    return bytes((x,))
 
-    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')
-        return x
-
-    def exec_path(path, ctx=None):
-        ctx = ctx or {}
-        with open(path, 'rb') as f:
-            code = f.read()
-        code = compile(code, f.name, 'exec')
-        exec(code, ctx)
-
-    def cmp(a, b):
-        return (a > b) - (a < b)
-
-    def int_to_byte(x):
-        return bytes((x,))
-
-    def reload(module):
-        import importlib
-        return importlib.reload(module)
-
-else:
-    exec("""def reraise(tp, value, tb=None):
-    try:
-        raise tp, value, tb
-    finally:
-        tb = None
-""")
-
-    from future_builtins import zip, map, filter  # noqa
-    range = xrange
-    import __builtin__ as builtins
-
-    codepoint_to_chr = unichr
-    unicode_type = unicode
-    string_or_bytes = unicode, bytes
-    string_or_unicode = str, unicode
-    long_type = long
-    exec_path = execfile
-    raw_input = builtins.raw_input
-    cmp = builtins.cmp
-    int_to_byte = chr
-    getcwd = os.getcwdu
-
-    def error_message(exc):
-        ans = exc.message
-        if isinstance(ans, bytes):
-            ans = ans.decode('utf-8', 'replace')
-        return ans
-
-    def iteritems(d):
-        return d.iteritems()
-
-    def itervalues(d):
-        return d.itervalues()
-
-    def environ_item(x):
-        if isinstance(x, unicode_type):
-            x = x.encode('utf-8')
-        return x
-
-    if hasattr(sys, 'getwindowsversion'):
-        def getenv(x, default=None):
-            if isinstance(x, bytes):
-                x = x.decode('mbcs', 'replace')
-
-            if getenv.buf is None:
-                import ctypes
-                import ctypes.wintypes as w
-                getenv.cub = ctypes.create_unicode_buffer
-                getenv.buf = getenv.cub(1024)
-                getenv.gev = ctypes.windll.kernel32.GetEnvironmentVariableW
-                getenv.gev.restype = w.DWORD
-                getenv.gev.argtypes = [w.LPCWSTR, w.LPWSTR, w.DWORD]
-            res = getenv.gev(x, getenv.buf, len(getenv.buf))
-            if res == 0:
-                return default
-            if res > len(getenv.buf) - 4:
-                getenv.buf = getenv.cub(res + 8)
-                res = getenv.gev(x, getenv.buf, len(getenv.buf))
-                if res == 0:
-                    return default
-            return getenv.buf.value
-        getenv.buf = None
-    else:
-        def getenv(x, default=None):
-            ans = os.getenv(x, default)
-            if isinstance(ans, bytes):
-                ans = ans.decode('utf-8', 'replace')
-            return ans
-
-    def reload(module):
-        return builtins.reload(module)
+def reload(module):
+    return importlib.reload(module)
 
 
 def print_to_binary_file(fileobj, encoding='utf-8'):
diff --git a/ebook_converter/ptempfile.py b/ebook_converter/ptempfile.py
index f0e9235..210f447 100644
--- a/ebook_converter/ptempfile.py
+++ b/ebook_converter/ptempfile.py
@@ -5,7 +5,7 @@ Provides platform independent temporary files that persist even after
 being closed.
 """
 import tempfile, os, atexit
-from ebook_converter.polyglot.builtins import map, getenv
+from ebook_converter.polyglot.builtins import getenv
 
 from ebook_converter.constants import (__version__, __appname__, filesystem_encoding,
         iswindows, get_windows_temp_path, isosx, ispy3)
diff --git a/ebook_converter/startup.py b/ebook_converter/startup.py
index 97b5177..30f2ea5 100644
--- a/ebook_converter/startup.py
+++ b/ebook_converter/startup.py
@@ -6,10 +6,13 @@ __docformat__ = 'restructuredtext en'
 Perform various initialization tasks.
 '''
 
-import locale, sys, os
+import builtins
+import locale
+import sys
+import os
 
 # Default translation is NOOP
-from ebook_converter.polyglot.builtins import builtins, is_py3, unicode_type
+from ebook_converter.polyglot.builtins import is_py3
 builtins.__dict__['_'] = lambda s: s
 
 # For strings which belong in the translation tables, but which shouldn't be
@@ -75,7 +78,7 @@ if not _run_once:
         winutil, winutilerror = plugins['winutil']
         if not winutil:
             raise RuntimeError('Failed to load the winutil plugin: %s'%winutilerror)
-        if len(sys.argv) > 1 and not isinstance(sys.argv[1], unicode_type):
+        if len(sys.argv) > 1 and not isinstance(sys.argv[1], str):
             sys.argv[1:] = winutil.argv()[1-len(sys.argv):]
 
         if not ispy3:
@@ -110,7 +113,7 @@ if not _run_once:
     if isosx:
         enc = 'utf-8'
     for i in range(1, len(sys.argv)):
-        if not isinstance(sys.argv[i], unicode_type):
+        if not isinstance(sys.argv[i], str):
             sys.argv[i] = sys.argv[i].decode(enc, 'replace')
 
     #
@@ -239,7 +242,7 @@ if not _run_once:
                     if name == 'Thread':
                         name = self.name
                 if name:
-                    if isinstance(name, unicode_type):
+                    if isinstance(name, str):
                         name = name.encode('ascii', 'replace').decode('ascii')
                     plugins['speedup'][0].set_thread_name(name[:15])
             except Exception:
diff --git a/ebook_converter/tinycss/fonts3.py b/ebook_converter/tinycss/fonts3.py
index cd32ec9..75c082b 100644
--- a/ebook_converter/tinycss/fonts3.py
+++ b/ebook_converter/tinycss/fonts3.py
@@ -1,6 +1,5 @@
 import re
 
-from ebook_converter.polyglot.builtins import map
 from ebook_converter.tinycss.css21 import CSS21Parser, ParseError
 from ebook_converter.tinycss.tokenizer import tokenize_grouped
 
diff --git a/ebook_converter/utils/cleantext.py b/ebook_converter/utils/cleantext.py
index f376d1e..101517e 100644
--- a/ebook_converter/utils/cleantext.py
+++ b/ebook_converter/utils/cleantext.py
@@ -1,6 +1,6 @@
 import re
 
-from ebook_converter.polyglot.builtins import codepoint_to_chr, map, range, filter
+from ebook_converter.polyglot.builtins import codepoint_to_chr
 from ebook_converter.polyglot.html_entities import name2codepoint
 from ebook_converter.constants import plugins, preferred_encoding
 
diff --git a/ebook_converter/utils/config_base.py b/ebook_converter/utils/config_base.py
index 479b5eb..b4f23e8 100644
--- a/ebook_converter/utils/config_base.py
+++ b/ebook_converter/utils/config_base.py
@@ -10,7 +10,7 @@ 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 unicode_type, iteritems, map
+from ebook_converter.polyglot.builtins import unicode_type, iteritems
 
 plugin_dir = os.path.join(config_dir, 'plugins')
 
diff --git a/ebook_converter/utils/filenames.py b/ebook_converter/utils/filenames.py
index 04d1f19..52a491b 100644
--- a/ebook_converter/utils/filenames.py
+++ b/ebook_converter/utils/filenames.py
@@ -13,7 +13,7 @@ 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, unicode_type, range
+from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type
 
 
 def ascii_text(orig):
diff --git a/ebook_converter/utils/fonts/metadata.py b/ebook_converter/utils/fonts/metadata.py
index 0729f72..85960db 100644
--- a/ebook_converter/utils/fonts/metadata.py
+++ b/ebook_converter/utils/fonts/metadata.py
@@ -3,7 +3,7 @@ from struct import calcsize, unpack, unpack_from
 from collections import namedtuple
 
 from ebook_converter.utils.fonts.utils import get_font_names2, get_font_characteristics
-from ebook_converter.polyglot.builtins import range, unicode_type
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/scanner.py b/ebook_converter/utils/fonts/scanner.py
index 2187e83..1533ae3 100644
--- a/ebook_converter/utils/fonts/scanner.py
+++ b/ebook_converter/utils/fonts/scanner.py
@@ -6,7 +6,7 @@ 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, unicode_type, filter
+from ebook_converter.polyglot.builtins import itervalues, unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/cff/dict_data.py b/ebook_converter/utils/fonts/sfnt/cff/dict_data.py
index 9fc5497..4436b14 100644
--- a/ebook_converter/utils/fonts/sfnt/cff/dict_data.py
+++ b/ebook_converter/utils/fonts/sfnt/cff/dict_data.py
@@ -1,5 +1,5 @@
 from struct import pack, unpack_from
-from ebook_converter.polyglot.builtins import range, unicode_type
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/cff/table.py b/ebook_converter/utils/fonts/sfnt/cff/table.py
index a8235ca..0bc37ed 100644
--- a/ebook_converter/utils/fonts/sfnt/cff/table.py
+++ b/ebook_converter/utils/fonts/sfnt/cff/table.py
@@ -6,7 +6,7 @@ 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, range
+from ebook_converter.polyglot.builtins import iteritems, itervalues
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/cmap.py b/ebook_converter/utils/fonts/sfnt/cmap.py
index 5fbe648..cfcdf0d 100644
--- a/ebook_converter/utils/fonts/sfnt/cmap.py
+++ b/ebook_converter/utils/fonts/sfnt/cmap.py
@@ -4,7 +4,6 @@ from collections import OrderedDict
 from ebook_converter.utils.fonts.utils import read_bmp_prefix
 from ebook_converter.utils.fonts.sfnt import UnknownTable, max_power_of_two
 from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont
-from ebook_converter.polyglot.builtins import range
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/common.py b/ebook_converter/utils/fonts/sfnt/common.py
index eaaaeca..85e3f92 100644
--- a/ebook_converter/utils/fonts/sfnt/common.py
+++ b/ebook_converter/utils/fonts/sfnt/common.py
@@ -2,7 +2,7 @@ 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 range, iteritems
+from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/head.py b/ebook_converter/utils/fonts/sfnt/head.py
index 02dce62..cd55018 100644
--- a/ebook_converter/utils/fonts/sfnt/head.py
+++ b/ebook_converter/utils/fonts/sfnt/head.py
@@ -3,7 +3,6 @@ from struct import unpack_from, pack, calcsize
 from ebook_converter.utils.fonts.sfnt import UnknownTable, DateTimeProperty, FixedProperty
 from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont
 from ebook_converter.utils.fonts.sfnt.loca import read_array
-from ebook_converter.polyglot.builtins import zip
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/kern.py b/ebook_converter/utils/fonts/sfnt/kern.py
index 898bcbb..ce65b3b 100644
--- a/ebook_converter/utils/fonts/sfnt/kern.py
+++ b/ebook_converter/utils/fonts/sfnt/kern.py
@@ -3,7 +3,6 @@ from struct import unpack_from, calcsize, pack, error as struct_error
 from ebook_converter.utils.fonts.sfnt import (UnknownTable, FixedProperty,
         max_power_of_two)
 from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont
-from ebook_converter.polyglot.builtins import range
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/loca.py b/ebook_converter/utils/fonts/sfnt/loca.py
index 98146ba..053e7d3 100644
--- a/ebook_converter/utils/fonts/sfnt/loca.py
+++ b/ebook_converter/utils/fonts/sfnt/loca.py
@@ -3,7 +3,7 @@ from operator import itemgetter
 from itertools import repeat
 
 from ebook_converter.utils.fonts.sfnt import UnknownTable
-from ebook_converter.polyglot.builtins import iteritems, range
+from ebook_converter.polyglot.builtins import iteritems
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/maxp.py b/ebook_converter/utils/fonts/sfnt/maxp.py
index bd94027..995cc93 100644
--- a/ebook_converter/utils/fonts/sfnt/maxp.py
+++ b/ebook_converter/utils/fonts/sfnt/maxp.py
@@ -2,7 +2,6 @@ from struct import unpack_from, pack
 
 from ebook_converter.utils.fonts.sfnt import UnknownTable, FixedProperty
 from ebook_converter.utils.fonts.sfnt.errors import UnsupportedFont
-from ebook_converter.polyglot.builtins import zip
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/sfnt/subset.py b/ebook_converter/utils/fonts/sfnt/subset.py
index 832e675..56802d1 100644
--- a/ebook_converter/utils/fonts/sfnt/subset.py
+++ b/ebook_converter/utils/fonts/sfnt/subset.py
@@ -6,7 +6,7 @@ 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 unicode_type, range, iteritems, itervalues, map
+from ebook_converter.polyglot.builtins import unicode_type, iteritems, itervalues
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/fonts/utils.py b/ebook_converter/utils/fonts/utils.py
index 80cc32d..04f6d12 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, unicode_type, range, as_bytes
+from ebook_converter.polyglot.builtins import iteritems, itervalues, unicode_type, as_bytes
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/icu.py b/ebook_converter/utils/icu.py
index 16e6877..822150d 100644
--- a/ebook_converter/utils/icu.py
+++ b/ebook_converter/utils/icu.py
@@ -5,7 +5,6 @@ import unicodedata
 # Setup code {{{
 from ebook_converter.constants import plugins
 from ebook_converter.polyglot.builtins import unicode_type, cmp
-from ebook_converter.polyglot.builtins import filter
 from ebook_converter.utils.config_base import tweaks
 
 
diff --git a/ebook_converter/utils/resources.py b/ebook_converter/utils/resources.py
index 688a65f..c5aa025 100644
--- a/ebook_converter/utils/resources.py
+++ b/ebook_converter/utils/resources.py
@@ -6,7 +6,6 @@ __docformat__ = 'restructuredtext en'
 import sys, os
 
 from ebook_converter import config_dir
-from ebook_converter.polyglot.builtins import builtins
 
 
 user_dir = os.path.join(config_dir, 'resources')
diff --git a/ebook_converter/utils/speedups.py b/ebook_converter/utils/speedups.py
index 10665e1..dc436e3 100644
--- a/ebook_converter/utils/speedups.py
+++ b/ebook_converter/utils/speedups.py
@@ -1,6 +1,6 @@
 import os
 
-from ebook_converter.polyglot.builtins import range, unicode_type
+from ebook_converter.polyglot.builtins import unicode_type
 
 
 class ReadOnlyFileBuffer(object):
diff --git a/ebook_converter/utils/terminal.py b/ebook_converter/utils/terminal.py
index d577454..682564f 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, range, zip, native_string_type
+from ebook_converter.polyglot.builtins import iteritems, native_string_type
 
 
 __license__ = 'GPL v3'
diff --git a/ebook_converter/utils/zipfile.py b/ebook_converter/utils/zipfile.py
index e279613..cdf434e 100644
--- a/ebook_converter/utils/zipfile.py
+++ b/ebook_converter/utils/zipfile.py
@@ -10,7 +10,7 @@ from tempfile import SpooledTemporaryFile
 from ebook_converter import sanitize_file_name
 from ebook_converter.constants import filesystem_encoding
 from ebook_converter.ebooks.chardet import detect
-from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes, getcwd, map, as_bytes
+from ebook_converter.polyglot.builtins import unicode_type, string_or_bytes, getcwd, as_bytes
 
 try:
     import zlib  # We may need its compression method