hai shi <shihai1...@126.com> added the comment:

How about:
1. Adding documentation as steven said.
2. If user use '-' of positional arguments in latest cpython, we cloud remind 
user that `the '-' of positional arguments be replaced by '_' since cpython 4.0`
3.Applying Simon Law's patch.

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nosy: +shihai1991

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<https://bugs.python.org/issue15125>
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