Chris Rebert <pyb...@rebertia.com> added the comment:

The term "invalid arguments" in "A ValueError will be raised if Popen is called 
with invalid arguments." is still vague. One could well argue that a 
nonexistent executable or bad command is "invalid". Anything resulting in an 
OSError can be considered "invalid" in a sense. The ValueError sentence should 
use a different descriptor or else include a qualifier.

+1 on calling out the shell=True case.
(My but how the `shell` argument complicates everything...)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14879>
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