  from rest_framework.validators import (
      UniqueForDateValidator, UniqueForMonthValidator, UniqueForYearValidator,
      UniqueTogetherValidator
  )
  import warnings
  
  
  # Note: We do the following so that users of the framework can use this style:
  #
  #     example_field = serializers.CharField(...)
 
</s> remove from django.conf import settings
 </s> add  </s> remove from django.test.client import Client as DjangoClient
from django.test.client import ClientHandler
 </s> add  </s> remove import re
 </s> add 
  from rest_framework.validators import (
      UniqueForDateValidator, UniqueForMonthValidator, UniqueForYearValidator,
      UniqueTogetherValidator
  )

  
  
  # Note: We do the following so that users of the framework can use this style:
  #
  #     example_field = serializers.CharField(...)
keep keep keep keep replace keep keep keep keep keep
 Cleanup import following PEP 8 style guide 
rest_framework/serializers.py