STINNER Victor added the comment:

https://docs.python.org/dev/library/os.html#os.pipe

Changed in version 3.4: The new file descriptors are now non-inheritable.

If you don't use the subprocess module, you may use os.set_inheritable().
https://docs.python.org/dev/library/os.html#os.set_inheritable

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<http://bugs.python.org/issue23288>
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