[issue13238] Add shell command helpers to shutil module

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Of the 3 available options (mod style, string.Template and str.format), yes, str.format is the best choice.

If people want the shell meaning of the braces, they can escape them by doubling them up in the command string.

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<http://bugs.python.org/issue13238>
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