Use `truediv` for python2 with `future` import, refs #11740#11787

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JukkaL merged 3 commits intopython:masterfrom

sobolevn:issue-11740

Feb 23, 2022

Commits on Dec 18, 2021

Revert "Revert "Imporves `__div__` with `__future__` import on py2 (#11276)" (#11741)"
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Use `__truediv__` for python2 with `__future__` import, refs #11740
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Commits on Feb 23, 2022

Add `future_import_flags` property to `MypyFile`
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