[issue20344] subprocess.check_output() docs misrepresent what shell=True does

[R. David Murray]

R. David Murray added the comment:

This was discussed in issue 6760.  There I advocated (and still advocate) option (3).  Unfortunately it looks like our doc update in that issue actually *lost* the documentation for your option (2) that used to be there, though it wasn't exactly clear what it meant when it was there.

So IMO we should do a doc update to add that info back in a clearer form, and also do a deprecation cycle to disallow shell=True with a sequence.  I haven't ever gotten consensus from the other devs on the latter, though.

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nosy: +r.david.murray
stage:  -> needs patch
versions: +Python 2.7, Python 3.4

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