code: def DEFINE_string(  # pylint: disable=invalid-name,redefined-builtin
      name, default, help, flag_values=_flagvalues.FLAGS, **args):
    
    parser = _argument_parser.ArgumentParser()
    serializer = _argument_parser.ArgumentSerializer()
    DEFINE(parser, name, default, help, flag_values, serializer, **args)
docs: Registers a flag whose value can be any string.