Set python_version to default to sys.version_info #4686
Merged
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This sets the default Python version used for type checking to
sys.version_info
.Fixes #4620.
The design of this is such that we set tests to default to the running Python whenever possible, but modify tests that use new syntax and libraries to run on Python 3.5 or 3.6.
Example output of failing tests on 3.4 before test changes https://gist.github.com/ethanhs/f782bec70eab0678d9e869465b40a571#file-output-log-L512.
This was split out of #4403