STINNER Victor added the comment:

Python 2 is not affected, PyFile_FromFile() doesn't check if the file 
descriptor is valid. On Python 3, we call fstat() to check the block size of 
the file descriptor to optimize buffering.

----------
versions: +Python 3.5, Python 3.6

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24891>
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