Mailman 3 [issue16399] argparse: append action with default list adds to list instead of overriding - docs

2 Jan 2020


      Change by hai shi shihai1991@126.com:
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pull_requests: +17226
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/17793
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Python tracker report@bugs.python.org
https://bugs.python.org/issue16399
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