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import argparse

parser = argparse.ArgumentParser()

group = parser.add_mutually_exclusive_group()

group.add_argument("-a", action="store_true")

group.add_argument("-b", action="store_true")

print(parser.parse_args())

# python argparse_mutually_exclusive.py -a

# python argparse_mutually_exclusive.py -b

# python argparse_mutually_exclusive.py -a -b <- error