Nick Coghlan <ncogh...@gmail.com> added the comment:

Given that importlib is essentially just doing "listdir", it would be 
interesting to know how the following behaves in a tight loop on affected 
systems:
    
    # Write a file
    f = open(os.path.join(dirname, "testname.py"), "w")
    f.write("text\n")
    f.close()
    # Make a directory
    os.mkdir(os.path.join(dirname, "testname"))
    # List the directory
    os.listdir(dirname)

The core assumption that test_pkg is indirectly making is that the directory 
listing in importlib will always list both entries created by the test suite 
without any special care being needed at the application level.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34200>
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