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import argparse
parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument('integers', metavar='N', type=int, nargs='+',
help='An integer for the accumulator.')
calculator_opts = parser.add_argument_group('Calculator Options')
calculator_opts.add_argument(
'-i', '--identity', type=int, default=0,
help='the default result for no arguments ' '(default: 0)')
calculator_opts.add_argument(
'--sum', dest='accumulate', action='store_const',
const=sum, default=max,
help='Sum the integers (default: find the max).')
if __name__ == '__main__':
args = parser.parse_args()
print(args.accumulate(args.integers))
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