def __call__(self, parser, namespace, values, option_string=None):
parser.print_help()
subparsers_actions = [
action for action in parser._actions
if isinstance(action, argparse._SubParsersAction)]
for subparsers_action in subparsers_actions:
for choice, subparser in subparsers_action.choices.items():
print("\n{}:\n{}".format(choice.upper(), "-" * (len(choice) + 1)))
print(subparser.format_help())
parser.exit()
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