[docs] [issue25299] TypeError: __init__() takes at least 4 arguments (4 given)

[R. David Murray]

R. David Murray added the comment:

To clarify this for other readers: the issue here is that the arguments to add_argument are passed through the action routine, which in this case is store_const, and store_const is the one that requires 'const' be specified...which isn't made clear by either the docs or the error message.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25299>
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