Message188887
| Author |
paul.j3 |
| Recipients |
amcnabb, bethard, docs@python, guilherme-pg, paul.j3, r.david.murray, v+python |
| Date |
2013年05月10日.22:39:01 |
| SpamBayes Score |
-1.0 |
| Marked as misclassified |
Yes |
| Message-id |
<1368225541.72.0.704146742925.issue14191@psf.upfronthosting.co.za> |
| In-reply-to |
| Content |
I should note one caveat:
As a consequence of setting nargs to 0 for the first 'parse_know_args' step, all positional entries in the namespace get an empty list value ([]). This is produced by 'ArgumentParser._get_values'. With the builtin action classes this does not cause any problems.
However a custom action class might have problems with this [] value.
For example in 'test_argparse.py', TestActionUserDefined the PositionalAction class does check the values and throws an error with this [] value.
The positional arguments are removed from the namespace before it is passed on to the 2nd 'parse_known_args', so these [] in the first don't affect the final namespace.
I don't think anything about this should be added to main documentation, since it could confuse most readers. I might add a note of warning to the code itself. |
|