[issue40707] Popen.communicate documentation does not say how to get the return code

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

This is not a security issue.

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nosy: +terry.reedy
versions:  -Python 3.5, Python 3.6

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<https://bugs.python.org/issue40707>
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