code: def get_parser():
      
      from argparse import ArgumentParser, ArgumentDefaultsHelpFormatter
      parser = ArgumentParser(description=__doc__,
                              formatter_class=ArgumentDefaultsHelpFormatter)
      parser.add_argument("-s1", dest="s1", help="sequence 1")
      parser.add_argument("-s2", dest="s2", help="sequence 2")
      return parser
docs: Get a parser object