[issue12713] argparse: allow abbreviation of sub commands by users

[Christian Ziemski]

Christian Ziemski <czml1 at gmx.de> added the comment:

Attached a patch against Python 3.3

All the existing tests are still running successfully.

But I wasn't able to add additional tests for the new functionality. 
Writing proper tests is a bit over my head for now - still learning.

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Added file: http://bugs.python.org/file22973/abbrev_subcmds_3.3.patch

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