paul j3 <ajipa...@gmail.com> added the comment:
Your code runs fine under 3.6.5.
But if I add 'subparsers.required=True', I get your error. It's having
problems formatting the name of the subparsers command when issuing the error
message.
If I add a 'dest' to the add_subparsers I get the expected error message:
import argparse
parser = argparse.ArgumentParser(description="Automatically process XML")
subparsers = parser.add_subparsers(title='subcommands', dest='cmd')
subparsers.required=True
chain_parser = subparsers.add_parser('chain', aliases=['c'],
help='Automatically run a chain of transformations')
args = parser.parse_args()
print(args)
The default 'dest' for subparsers is None, and the error arises from
','.join([None])
The problems with a missing 'dest' came up in earlier discussions about making
required/not required subparsers. 3.7 made subparsers 'required' by default,
but it appears that it hasn't addressed this missing 'dest' problem.
But I haven't followed the latest release details closely.
----------
nosy: +paul.j3
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<https://bugs.python.org/issue34191>
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