Matt Pr added the comment:
Same AssertionError is also caused by having certain "choices".
Python 2.7.10
global_options.add_argument('--field-sep', choices=[',',';','|','\t'],
required=True, help='Field separator that separates columns in a row.')
Removing required=True or removing the tab (\t) from the options both work
around this usage formatter issue for me.
I know this is an old issue but figured I would add another repro case to help
whoever might work on this.
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nosy: +mattpr
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<http://bugs.python.org/issue11874>
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