def get_argument_topology(self):
    """
    Helper function to get topology argument.
    Raises exception if argument is missing.
    Returns the topology argument.
    """
    try:
      topology = self.get_argument(constants.PARAM_TOPOLOGY)
      return topology
    except tornado.web.MissingArgumentError as e:
      raise Exception(e.log_message)
def get_argument_topology(self):
    """
    Helper function to get topology argument.
    Raises exception if argument is missing.
    Returns the topology argument.
    """
    try:
      topology = self.get_argument(constants.PARAM_TOPOLOGY)
      return topology
    except tornado.web.MissingArgumentError as e:
      raise Exception(e.log_message)
def get_argument_topology ( self ) : try : topology = self . get_argument ( constants . PARAM_TOPOLOGY ) return topology except tornado . web . MissingArgumentError as e : raise Exception ( e . log_message )
Helper function to get topology argument.
    Raises exception if argument is missing.
    Returns the topology argument.
Helper function to get topology argument . Raises exception if argument is missing . Returns the topology argument .