Message391250
When creating a simple required subparser the following will result in an error instead of an error message:
>>> from argparse import ArgumentParser
>>>
>>> parser = ArgumentParser()
>>> subparsers = parser.add_subparsers(required=True)
>>> subparsers.add_parser('one')
>>> subparsers.add_parser('two')
>>>
>>> parser.parse_args([])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python3.8/argparse.py", line 1768, in parse_args
args, argv = self.parse_known_args(args, namespace)
File "/usr/lib64/python3.8/argparse.py", line 1800, in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
File "/usr/lib64/python3.8/argparse.py", line 2035, in _parse_known_args
', '.join(required_actions))
TypeError: sequence item 0: expected str instance, NoneType found
Looking at the code this is because the subparser is actually an action and when resolving the name it uses `None` as the subparser name which results in the error above. |
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Date |
User |
Action |
Args |
2021-04-16 19:07:46 | terence.honles | set | recipients:
+ terence.honles |
2021-04-16 19:07:46 | terence.honles | set | messageid: <1618600066.88.0.240618154113.issue43874@roundup.psfhosted.org> |
2021-04-16 19:07:46 | terence.honles | link | issue43874 messages |
2021-04-16 19:07:46 | terence.honles | create | |
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