asyncio.Task.all_tasks()是方法，只返回当前循环中所有挂起和运行的给定任务类型（默认为所有任务类型）。而asyncio.all_tasks()是一个协程函数，返回所有当前任务（挂起，正在运行，以及已完成的）的集合。

代码示例：

import asyncio

async def coro():
    await asyncio.sleep(1)

async def main():
    task = asyncio.create_task(coro())
    # run the coro
    await asyncio.sleep(0.5)
    all_tasks_1 = {t._coro for t in asyncio.Task.all_tasks()}
    print(f"all_tasks_1: {all_tasks_1}") 
    # print set() since the coro is running, not finished yet

    all_tasks_2 = await asyncio.all_tasks()
    print(f"all_tasks_2: {all_tasks_2}")
    # print ALL tasks, explicit base loop + implicit default loop
    # set() if there are no other running tasks besides main()

asyncio.run(main())