> I suggest also ignoring ENOTDIR and EISDIR. Not sure about EACCES.

We should maybe mimick the io module:


>>> open('Lib')
IsADirectoryError: [Errno 21] Is a directory: 'Lib'

In the io module, opening a directory raises an exception. In the import machinery, an explicit check is done (stat+ISDIR) before opening the file. The file is ignored if it is a directory. We can maybe remove the test before opening the file, and handle IsADirectoryError exception instead.

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I don't think that fopen() can fails with ENOTDIR. rmdir() can fail with ENOTDIR.

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For EACCES: Python ignores currently these errors. I was already surprised by this behaviour. My use case: I have two users (haypo and fusil). I "installed" a module of haypo user into /usr/lib/python... using symlink, but fusil doesn't have access to /home/haypo. When fusil tries to load a module, import fails without any warning or error.

Fail with an error is maybe not a good idea because it's not because a directory of sys.path cannot be read, than the import will fail. The module can be found in another (accessible) directory.