paul j3 added the comment:
There's a complicating issue - should these default values be passed through
the type function?
In most cases in `_get_values`, the string first goes through `_get_value`, and
then to `_check_value`.
For example the 'else:' case:
value = [self._get_value(action, v) for v in arg_strings]
for v in value:
self._check_value(action, v)
The '*' positional case could coded the same way, allowing:
parser.add_argument('foo',
nargs='*',
type=int,
choices=range(5),
default=['0',1,'2'])
and objecting to
default=[6,'7','a'] # out of range string or int or invalid value
This does impose a further constraint on the 'type' function, that it accepts a
converted value. e.g. int(1) is as valid as int('1').
But we need to be careful that this case is handled in a way that is consistent
with other defaults (including the recent change that delayed evaluating
defaults till the end).
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<http://bugs.python.org/issue9625>
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