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Title: bpo-43874: fix argparse sub parser error when sub parser has no "name" by terencehonles · Pull Request #25446 · python/cpython · GitHub

Open Graph Title: bpo-43874: fix argparse sub parser error when sub parser has no "name" by terencehonles · Pull Request #25446 · python/cpython

X Title: bpo-43874: fix argparse sub parser error when sub parser has no "name" by terencehonles · Pull Request #25446 · python/cpython

Description: This change updates the following crash to instead produce the error message "%(prog)s: error: the following arguments are required: command". Previously, when creating a simple required sub parser 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 "", line 1, in 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 https://bugs.python.org/issue43874

Open Graph Description: This change updates the following crash to instead produce the error message "%(prog)s: error: the following arguments are required: command". Previously, when creating a simple required ...

X Description: This change updates the following crash to instead produce the error message "%(prog)s: error: the following arguments are required: command". Previously, when creating a simple r...

Opengraph URL: https://github.com/python/cpython/pull/25446

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8a71994 fix argparse sub parser error when sub parser has no "name" terencehonles Apr 16, 2021 https://github.com/python/cpython/pull/25446/commits/8a719942d800d998b150602288e3e86b8ef7e70e
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