Fred L. Drake, Jr. added the comment:

It's not at all obvious that the intention is to ensure such an argument should 
be treated only as a command external to the shell.

If an application really wants to ensure the command is not handled as a shell 
built-in, it should use shell=False.

Making this clear in the documentation is reasonable.

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nosy: +fdrake

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26124>
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