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Description
After upgrading to 3.3.3 from 3.3.0, found that my app was broken running under python 3.5 which should not have happened for a point release. After checking the releases, it seems due to the file mypy_helpers.py
in the test directory using python 3.6 code on line 15:
with open(f'{tempdirname}/__main__.py', 'w') as f:
Thanks