[issue16399] argparse: append action with default list adds to list instead of overriding

[Roy Smith]

Roy Smith <roy at panix.com> added the comment:

I just got bit by this in Python 3.5.3.

I get why it does this.  I also get why it's impractical to change the behavior now.  But, it really isn't the obvious behavior, so it should be documented at https://docs.python.org/3.5/library/argparse.html?highlight=argparse#default.

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nosy: +roysmith

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