bpo-42043: Inheritance support for zipfile.Path for .parent, /, joinpath

[Conchylicultor]

Copying https://bugs.python.org/issue42043

Currently, zipfile.Path inheritance behavior is inconsistent with pathlib.Path:

class MyPath(zipfile.Path):
  pass


path = MyPath(zf)
path = path.joinpath('other')
assert isinstance(path, MyPath)  # Oups, type(path) is zipfile.Path

Calling parent, /,... should keep the class, as for pathlib.Path

Use case: I'm writing a wrapper around zipfile.Path which adds os.fspath compatibility (the file is extracted in a tmp dir when os.path.join, open,...).

https://bugs.python.org/issue42043

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[Conchylicultor]

How long does it takes for the CLA to be updated ? I received the confirmation PDF through my mailbox, but https://check-python-cla.herokuapp.com/ indicates conchylicultor has not signed CLA ❌

[jaraco]

As mentioned in the bug, this issue is fixed in the backport 3.2.0 release. I'd like to port the tests from here and then port the updates to CPython. How's that sound?

[jaraco]

Hmm. Interestingly, applying the test on zipp master fails, so perhaps it's not solved in 3.2.0.

edit: The test just needed a tweak from zipfile to zipp and it now passes.

[jaraco]

Please have a look at #22716 and zipp 3.2.0 and later. Thanks for the bug report and patch.