bpo-42973: argparse: mixing optional and positional #24259
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Allow positional parameter with nargs='*' to match more than once without reordering parameters. Restoration of old patch from bpo-14191.
New parameter to ArgumentParser constructor - 'greedy' makes positional parameters consume multiple groups of command-line arguments. Added tests and docs.
Fixed silly mistake in example in docs.
Removed 'greedy' parameter, added nargs='**'
Restored original ArgumentParser signature in argparse.rst
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argparse: allow positional parameter with nargs='*' to match more than once without reordering parameters.
Restoration of old patch from bpo-14191.
https://bugs.python.org/issue42973