      self.assertEqual(books[1].object.title, book2['title'])
      self.assertEqual(books[1].object.pk, None)
  
  
  for format in [
              f for f in serializers.get_serializer_formats()
              if not isinstance(serializers.get_serializer(f), serializers.BadSerializer)
  ]:
      setattr(SerializerTests, 'test_' + format + '_serializer', curry(serializerTest, format))
      setattr(SerializerTests, 'test_' + format + '_natural_key_serializer', curry(naturalKeySerializerTest, format))
      setattr(SerializerTests, 'test_' + format + '_serializer_fields', curry(fieldsTest, format))
      setattr(SerializerTests, 'test_' + format + '_serializer_natural_keys', curry(naturalKeyTest, format))
      if format != 'python':
 
</s> remove             settings.AUTHENTICATION_BACKENDS) + (backend, ))
 </s> add         settings.AUTHENTICATION_BACKENDS) + (backend, )) </s> remove                 signing.base64_hmac('extra-salt' + 'signer',
                'hello', 'predictable-secret').decode()
 </s> add             signing.base64_hmac('extra-salt' + 'signer',
                                'hello', 'predictable-secret').decode() </s> remove                 repr(datetime.datetime.fromtimestamp(ts + 3600, tz)),
                'datetime.datetime(2010, 11, 7, 1, 0, tzinfo=EST)')
 </s> add             repr(datetime.datetime.fromtimestamp(ts + 3600, tz)),
            'datetime.datetime(2010, 11, 7, 1, 0, tzinfo=EST)') </s> remove                 repr(datetime.datetime.fromtimestamp(ts - 3600, tz)),
                'datetime.datetime(2010, 11, 7, 0, 0, tzinfo=EST)')
 </s> add             repr(datetime.datetime.fromtimestamp(ts - 3600, tz)),
            'datetime.datetime(2010, 11, 7, 0, 0, tzinfo=EST)') </s> remove                         form[cl.model._meta.pk.name].is_hidden)):
 </s> add                     form[cl.model._meta.pk.name].is_hidden)):
for format in [f for f in serializers.get_serializer_formats()
               if not isinstance(serializers.get_serializer(f), serializers.BadSerializer)]:
      self.assertEqual(books[1].object.title, book2['title'])
      self.assertEqual(books[1].object.pk, None)
  
  
for format in [f for f in serializers.get_serializer_formats()
               if not isinstance(serializers.get_serializer(f), serializers.BadSerializer)]:
for format in [f for f in serializers.get_serializer_formats()
               if not isinstance(serializers.get_serializer(f), serializers.BadSerializer)]:
for format in [f for f in serializers.get_serializer_formats()
               if not isinstance(serializers.get_serializer(f), serializers.BadSerializer)]:
for format in [f for f in serializers.get_serializer_formats()
               if not isinstance(serializers.get_serializer(f), serializers.BadSerializer)]:
      setattr(SerializerTests, 'test_' + format + '_serializer', curry(serializerTest, format))
      setattr(SerializerTests, 'test_' + format + '_natural_key_serializer', curry(naturalKeySerializerTest, format))
      setattr(SerializerTests, 'test_' + format + '_serializer_fields', curry(fieldsTest, format))
      setattr(SerializerTests, 'test_' + format + '_serializer_natural_keys', curry(naturalKeyTest, format))
      if format != 'python':
keep keep keep keep replace replace replace replace keep keep keep keep keep
 Fixed #21288 -- Fixed E126 pep8 warnings 
tests/serializers_regress/tests.py