code: def _generate_route_keys(self, methods, path):
          
          for method in methods:
              yield self._route_key(method, path)
docs: Generates the key to the _dict_of_routes based on the list of methods
          and path supplied
  
          :param list(str) methods: List of HTTP Methods
          :param str path: Path off the base url
          :return: str of Path:Method