[issue13192] ImportError silences low-level OS errors

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> _Py_fopen() returns NULL without raising an exception if fopen() fails.
> 
> Attached patch raises a OSError if fopen() if errno is different than
> ENOENT. I don't know if ENOENT is the right error number on Windows.

It seems so.

>  Should we ignore more error numbers, like EACCESS?

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

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<http://bugs.python.org/issue13192>
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