eg_arg.py

import argparse

arg_parser = argparse.ArgumentParser()

def time_argument(func):
    def _(*args, **kwargs):
        arg_parser.add_argument('-b', '--begin_time', nargs='?', default=None, help='begin time, use yesterday if omit')
        arg_parser.add_argument('-e', '--end_time', nargs='?', default=None, help='end time, use next day of begin_time if omit')
        return func(*args, **kwargs)
    return _

def logger_argument(func):
    def _(*args, **kwargs):
        arg_parser.add_argument('-d', '--debug', action='store_true')
        arg_parser.add_argument('-f', '--file', type=str, help='logging file')
        return func(*args, **kwargs)
    return _

@logger_argument
@time_argument
def main():
    args = arg_parser.parse_args()
    print args

if __name__ == '__main__':
    main()