Removed polyglots unicode_type usage

ebook_converter/ebooks/oeb/reader.py

@@ -23,7 +23,6 @@ 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
 from ebook_converter.polyglot.urllib import unquote
 
 
@@ -144,7 +143,7 @@ class OEBReader(object):
                 dict(a=__appname__, v=__version__)
         meta_info_to_oeb_metadata(mi, self.oeb.metadata, self.logger)
         m = self.oeb.metadata
-        m.add('identifier', unicode_type(uuid.uuid4()), id='uuid_id', scheme='uuid')
+        m.add('identifier', str(uuid.uuid4()), id='uuid_id', scheme='uuid')
         self.oeb.uid = self.oeb.metadata.identifier[-1]
         if not m.title:
             m.add('title', self.oeb.translate(__('Unknown')))
@@ -447,7 +446,7 @@ class OEBReader(object):
         ncx = item.data
         title = ''.join(xpath(ncx, 'ncx:docTitle/ncx:text/text()'))
         title = COLLAPSE_RE.sub(' ', title.strip())
-        title = title or unicode_type(self.oeb.metadata.title[0])
+        title = title or str(self.oeb.metadata.title[0])
         toc = self.oeb.toc
         toc.title = title
         navmaps = xpath(ncx, 'ncx:navMap')
@@ -634,7 +633,7 @@ class OEBReader(object):
 
     def _locate_cover_image(self):
         if self.oeb.metadata.cover:
-            id = unicode_type(self.oeb.metadata.cover[0])
+            id = str(self.oeb.metadata.cover[0])
             item = self.oeb.manifest.ids.get(id, None)
             if item is not None and item.media_type in OEB_IMAGES:
                 return item