paul j3 added the comment:
Looks like this behavior is intentional. This subclass adds a '%(default)s'
string to the help lines if:
if '%(default)' not in action.help:
if action.default is not SUPPRESS:
defaulting_nargs = [OPTIONAL, ZERO_OR_MORE]
if action.option_strings or action.nargs in defaulting_nargs:
help += ' (default: %(default)s)'
So it adds the default if it is an `optional`, or a `positional` with '*' or
'?'.
A `default` value for a required positional (including '+') does not make
sense, since the user input always overwrites the default.
(I recommend closing this issue).
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nosy: +paul.j3
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<http://bugs.python.org/issue15613>
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