code: def op_paths(self, path_base=None):
          # type: (Union[str, UrlPath]) -> Generator[Tuple[UrlPath, Operation]]
          
          if path_base:
              path_base += self.path_prefix
          else:
              path_base = self.path_prefix or UrlPath()
  
          for container in self.containers:
              for op_path in container.op_paths(path_base):
                  yield op_path
docs: Return all operations stored in containers.