[issue25320] unittest loader.py TypeError when code directory contains a socket

[Robert Collins]

Robert Collins added the comment:

The fix is appropriate (we might want to think about symlinks in the future). I'd very much like a test for it (in Lib/unittest/test/test_discovery.py) and it should be applied to 3.5, master - older versions had this wrapped up in simpler code and won't fail like this.

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stage:  -> patch review

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<http://bugs.python.org/issue25320>
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