R. David Murray added the comment:

If you use shell=True you can do almost anything you can do in the shell, but 
making it safe is up to you.  We provide shlex.quote to help you with that, but 
only you can know what parts of the expression need quoting and what don't.

It sounds like you might find the stdlib 'pipes' module interesting.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27457>
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