paul j3 added the comment:

This assertion error caused by brackets (and other 'odd' characters) in the 
metavar is a known issue.

http://bugs.python.org/issue11874
http://bugs.python.org/issue14046

The formatter that handles line wrapping of the usage line is fragile.

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nosy: +paul.j3

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<http://bugs.python.org/issue25058>
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