  from django.core.exceptions import ValidationError as DjangoValidationError
  from django.core.validators import RegexValidator, ip_address_validators
  from django.forms import ImageField as DjangoImageField
  from django.utils import six, timezone
  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 _
  from django.utils.ipv6 import clean_ipv6_address
  from rest_framework import ISO_8601
  from rest_framework.compat import (
      EmailValidator, MinValueValidator, MaxValueValidator,
      MinLengthValidator, MaxLengthValidator, URLValidator, OrderedDict,
 
</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 rest_framework.exceptions import ValidationError
from rest_framework.settings import api_settings
from rest_framework.utils import html, representation, humanize_datetime
import collections
import copy
import datetime
import decimal
import inspect
import re
import uuid
 </s> add 
  from django.core.exceptions import ValidationError as DjangoValidationError
  from django.core.validators import RegexValidator, ip_address_validators
  from django.forms import ImageField as DjangoImageField
  from django.utils import six, timezone



  from django.utils.ipv6 import clean_ipv6_address
  from rest_framework import ISO_8601
  from rest_framework.compat import (
      EmailValidator, MinValueValidator, MaxValueValidator,
      MinLengthValidator, MaxLengthValidator, URLValidator, OrderedDict,
keep keep keep keep replace replace replace keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/fields.py