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

[paul j3]

paul j3 added the comment:

In my suggestion I used 

    if 'current_value is default':

without going into detail.  The use of an 'is' test for integer values is tricky, as discussed in http://bugs.python.org/issue18943

    int("42") is 42    # True
    int("257") is 257  # False

As with your 'self.reset_dest', in 18943 I suggested using a boolean flag instead of the 'is' test.

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