  from __future__ import unicode_literals
  from django.conf import settings
  from django.utils import six, timezone
  from django.utils.ipv6 import clean_ipv6_address
  from django.utils.translation import ugettext_lazy as _
  from django.forms import ImageField as DjangoImageField
  from django.utils.encoding import is_protected_type, smart_text
 
</s> remove from django.core.exceptions import ObjectDoesNotExist
from django.core.exceptions import ValidationError as DjangoValidationError
from django.core.validators import RegexValidator, ip_address_validators
from django.forms import ImageField as DjangoImageField
 </s> add  </s> remove from django.utils.dateparse import parse_date, parse_datetime, parse_time
from django.utils.encoding import is_protected_type, smart_text
from django.utils.translation import ugettext_lazy as _
 </s> add  </s> remove from django.utils.translation import ugettext_lazy as _
 </s> add from django.core.exceptions import PermissionDenied
import re
import copy
import uuid
import decimal
import inspect
import datetime
import collections

  from __future__ import unicode_literals
import re
import copy
import uuid
import decimal
import inspect
import datetime
import collections

  from django.conf import settings
  from django.utils import six, timezone
  from django.utils.ipv6 import clean_ipv6_address
  from django.utils.translation import ugettext_lazy as _
  from django.forms import ImageField as DjangoImageField
  from django.utils.encoding import is_protected_type, smart_text
add keep keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/fields.py