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Accurate return types for ZipFile.open() and zipfile.Path.open() #13069

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@AT0myks AT0myks commented Nov 22, 2024

An attempt to close #13051. Initially I used SizedBuffer for data in _ZipWriteFile.write() but this resulted in LSP violations.
For Python 3.8 _ReadWriteBinaryMode is replaced by _ReadWriteMode in zipfile.Path.open() because it did not yet accept modes rb and wb.
If I understand correctly, tests are failing because zipfile.Path.open(mode="rb") which now returns ZipExtFile does not comply anymore with importlib.abc.Traversable.open(mode="rb") which returns IO[bytes] and I'm not sure how this should be addressed.

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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

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ZipFile.open() return type
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