code: def _event_func_names(self, event: str) -> List[str]:
          
          return [func.__name__ for func in self._events[event]]
docs: Returns string name of each function subscribed to an event.
  
          :param event: Name of the event.
          :type event: str
  
          :return: Names of functions subscribed to a specific event.
          :rtype: list