[WIP] PEP 560 implementation

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-665 into branch/py3.7

Created originally on Bitbucket by Yannick_Jadoul (Yannick Jadoul)

Was already merged in Bitbucket before import, marked as merged by the import user

Source changeset not longer availableat the time of import. Commit listwill look empty

Follow-up on pull request #664 (closed)

  • Fixed __class_getitem__ to always be classmethod even if not decorated as such.
  • Work on __mro_entries__ is still in progess.

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