R. David Murray <rdmur...@bitdance.com> added the comment:

Because the shell argument provides important functionality.  Or are you 
suggesting that passing a list implies shell=False and passing a string implies 
shell=True?  That is a possibility, but I think it would not be a good idea, 
because people will 'accidentally' get shell=True (which, you will note is 
*not* the default), which is less secure.  It is much better, IMO, to make 
people ask explicitly for the less-safe behavior.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7839>
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