[issue7913] Enhance Cmd support for docstrings and document it.

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

You can apply the patch (which includes tests) and edit the code of cmd.py to use cleandoc.

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versions: +Python 3.3 -Python 3.2

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<http://bugs.python.org/issue7913>
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