  from rest_framework.compat import six
  from rest_framework.compat import smart_text
  from rest_framework.compat import yaml
  from rest_framework.settings import api_settings
  from rest_framework.request import clone_request
  from rest_framework.utils import encoders
  from rest_framework.utils.breadcrumbs import get_breadcrumbs
  from rest_framework import exceptions, status, VERSION
  
  
 
</s> remove from rest_framework.renderers import UnicodeJSONRenderer
 </s> add from rest_framework import renderers </s> remove             #'sub_comment': ''
 </s> add             'sub_comment': '' </s> remove             if obj is None and field.read_only:
                continue
 </s> add 
from rest_framework.request import clone_request, is_form_media_type
  from rest_framework.compat import six
  from rest_framework.compat import smart_text
  from rest_framework.compat import yaml
  from rest_framework.settings import api_settings
from rest_framework.request import clone_request, is_form_media_type
  from rest_framework.utils import encoders
  from rest_framework.utils.breadcrumbs import get_breadcrumbs
  from rest_framework import exceptions, status, VERSION
  
  
keep keep keep keep replace keep keep keep keep keep
 Simplifying raw data renderering support 
rest_framework/renderers.py