  from rest_framework.exceptions import ParseError
  from rest_framework.settings import api_settings
  from rest_framework.utils.breadcrumbs import get_breadcrumbs
  from rest_framework.utils.field_mapping import ClassLookupDict
  
  
  def zero_as_none(value):
      return None if value == 0 else value
  
 
</s> remove from rest_framework.request import is_form_media_type, override_method
from rest_framework.utils import encoders
 </s> add  </s> remove from django.test.client import encode_multipart
from django.utils import six
from rest_framework import exceptions, serializers, status, VERSION
from rest_framework.compat import SHORT_SEPARATORS, LONG_SEPARATORS, INDENT_SEPARATORS
 </s> add from rest_framework.utils import encoders </s> remove import sys
import warnings
 </s> add 
from rest_framework import exceptions, serializers, status, VERSION
from rest_framework.request import is_form_media_type, override_method
from rest_framework.compat import (
    SHORT_SEPARATORS, LONG_SEPARATORS, INDENT_SEPARATORS
)
  from rest_framework.exceptions import ParseError
  from rest_framework.settings import api_settings
  from rest_framework.utils.breadcrumbs import get_breadcrumbs
  from rest_framework.utils.field_mapping import ClassLookupDict
from rest_framework import exceptions, serializers, status, VERSION
from rest_framework.request import is_form_media_type, override_method
from rest_framework.compat import (
    SHORT_SEPARATORS, LONG_SEPARATORS, INDENT_SEPARATORS
)
  
  
  def zero_as_none(value):
      return None if value == 0 else value
  
keep keep keep add keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/renderers.py