paul j3 added the comment:
If the empty argument group has a 'description' it is displayed. For example
with positionals group that I mentioned earlier:
parser = argparse.ArgumentParser()
parser._action_groups[0].description = 'test'
parser.print_help()
produces
usage: ipython [-h]
positional arguments:
test
optional arguments:
-h, --help show this help message and exit
So the user can fix this empty group display issue by setting this
'description' value to None.
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<http://bugs.python.org/issue9350>
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