Thomas Kluyver added the comment:
Jeff: This makes it somewhat easier to handle input and output as strings
instead of streams. Most of the functionality was already there, but this makes
it more broadly useful. It doesn't especially address your other points, but
I'm not aiming to completely overhaul subprocess.
> for string commands, shell should always be true. for list/Tupperware
> commands, shell should be false
I wondered why this is not the case before, but on Windows a subprocess is
actually launched by a string, not a list. And on POSIX, a string without
shell=True is interpreted like a one-element list, so you can do e.g.
Popen('ls') instead of Popen(['ls']). Changing that would probably break
backwards compatibility in unexpected ways.
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<http://bugs.python.org/issue23342>
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