code: async def cancel(self, task: asyncio.Task, wait_for: bool = True) -> Any:
          
          if task is None:
              return
  
          task.cancel()
  
          with suppress(KeyError):
              self._tasks.remove(task)
  
          with suppress(Exception):
              return (await task) if wait_for else None
docs: Cancels and waits for an `asyncio.Task` to finish.
          Removes it from the collection of managed tasks.
  
          Args:
              task (asyncio.Task):
                  The to be cancelled task.
                  It is not required that the task was was created with `TaskScheduler.create_task()`.
  
              wait_for (bool, optional):
                  Whether to wait for the task to finish execution.
                  If falsey, this function returns immediately after cancelling the task.
  
          Returns:
              Any: The return value of `task`. None if `wait_for` is falsey.