  from rest_framework import exceptions, serializers
  from rest_framework.compat import ProhibitNullCharactersValidator
  from rest_framework.fields import DjangoImageField, is_simple_callable
  
  try:
      import typing
  except ImportError:
      typing = False
  
  
  # Tests for helper functions.
  # ---------------------------
  
  class TestIsSimpleCallable:
  
 
</s> remove import unittest
 </s> add  </s> remove REQUIRED_PYTHON = (3, 4)
 </s> add REQUIRED_PYTHON = (3, 5) </s> remove        {py34,py35,py36}-django111,
       {py34,py35,py36,py37}-django20,
 </s> add        {py35,py36}-django111,
       {py35,py36,py37}-django20, </s> remove     @unittest.skipUnless(typing, 'requires python 3.5')
 </s> add  </s> remove         'Programming Language :: Python :: 3.4',
 </s> add 
  from rest_framework import exceptions, serializers
  from rest_framework.compat import ProhibitNullCharactersValidator
  from rest_framework.fields import DjangoImageField, is_simple_callable
  






  # Tests for helper functions.
  # ---------------------------
  
  class TestIsSimpleCallable:
  
keep keep keep keep replace replace replace replace replace replace keep keep keep keep keep
 Drop Python 3.4 support (#6620) 
tests/test_fields.py