Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
I tried to use add_subparsers() with required=True and have found it not usable.
import argparse
parser = argparse.ArgumentParser(prog='PROG')
subparsers = parser.add_subparsers(required=True)
parser_a = subparsers.add_parser('a')
parser_b = subparsers.add_parser('b')
parser.parse_args([])
The result:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/serhiy/py/cpython/Lib/argparse.py", line 1745, in parse_args
args, argv = self.parse_known_args(args, namespace)
File "/home/serhiy/py/cpython/Lib/argparse.py", line 1777, in parse_known_args
namespace, args = self._parse_known_args(args, namespace)
File "/home/serhiy/py/cpython/Lib/argparse.py", line 2012, in
_parse_known_args
', '.join(required_actions))
TypeError: sequence item 0: expected str instance, NoneType found
Seems that not only the default value should be changed, but the whole PR 3027
should be reverted.
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nosy: +serhiy.storchaka
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33109>
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