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.

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

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<http://bugs.python.org/issue20344>
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