  import datetime
  import os
  import re
  import unittest
  import uuid
  from decimal import ROUND_DOWN, ROUND_UP, Decimal
  
  import pytest
  import pytz
 
</s> remove try:
    import typing
except ImportError:
    typing = False


 </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 
  import datetime
  import os
  import re

  import uuid
  from decimal import ROUND_DOWN, ROUND_UP, Decimal
  
  import pytest
  import pytz
keep keep keep replace keep keep keep keep keep
 Drop Python 3.4 support (#6620) 
tests/test_fields.py