Message111324
If you use set_defaults on a subparser, but a default exists on the top level parser, the subparser defaults are ignored:
>>> parser = argparse.ArgumentParser()
>>> xparser = parser.add_subparsers().add_parser('X')
>>> parser.set_defaults(foo=1)
>>> xparser.set_defaults(foo=2)
>>> parser.parse_args(['X'])
Namespace(foo=1)
This is counter to what people probably expect, that the subparser, when selected, would override the top level parser.
The behavior is because of the following code in parse_known_args:
for dest in self._defaults:
if not hasattr(namespace, dest):
setattr(namespace, dest, self._defaults[dest])
This happens before the subparser sees the namespace object, and so the subparser sees that no defaults need to be filled in. |
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Date |
User |
Action |
Args |
2010-07-23 14:06:52 | bethard | set | recipients:
+ bethard |
2010-07-23 14:06:52 | bethard | set | messageid: <1279894012.43.0.0678646409.issue9351@psf.upfronthosting.co.za> |
2010-07-23 14:06:50 | bethard | link | issue9351 messages |
2010-07-23 14:06:50 | bethard | create | |
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