code: def DEFINE_multi(  # pylint: disable=g-bad-name,redefined-builtin
      parser, serializer, name, default, help, flag_values=FLAGS,
      module_name=None, **args):
    
    DEFINE_flag(MultiFlag(parser, serializer, name, default, help, **args),
                flag_values, module_name)
docs: Registers a generic MultiFlag that parses its args with a given parser.
  
    Auxiliary function.  Normal users should NOT use it directly.
  
    Developers who need to create their own 'Parser' classes for options
    which can appear multiple times can call this module function to
    register their flags.
  
    Args:
      parser: ArgumentParser that is used to parse the flag arguments.
      serializer: ArgumentSerializer that serializes the flag value.
      name: A string, the flag name.
      default: The default value of the flag.
      help: A help string.
      flag_values: FlagValues object with which the flag will be registered.
      module_name: A string, the name of the Python module declaring this flag.
          If not provided, it will be computed using the stack trace of this call.
      **args: Dictionary with extra keyword args that are passed to the
          Flag __init__.