[issue9554] test_argparse.py: use new unittest features

[Radu Voicilas]

Radu Voicilas <radu.voicilas at gmail.com> added the comment:

Hi Eric, Denver's patch should apply correctly from the root. Also, I've made the changes you mention:

try: except: assert

has been replaced by:

with self.assertRaises()

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Added file: http://bugs.python.org/file25659/test_argparse.py.take2

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