[issue9554] test_argparse.py: use new unittest features

[Denver Coneybeare]

Changes by Denver Coneybeare <denver.coneybeare at gmail.com>:


Removed file: http://bugs.python.org/file18463/test_argparse.py.unittest2.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9554>
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