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