[issue30418] test_communicate_epipe() of test_subprocess fails randomly on AMD64 Windows7 SP1 3.x

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


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versions: +Python 2.7, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30418>
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