协程的嵌套（协程使用场景）

协程的嵌套（协程使用场景）

# coding: utf-8# @Time : 2022-05-17 13:15# @Author : AngDHimport asyncioimport timenow = lambda: time.time()async def task1(): await asyncio.sleep(1) print("task1 done") return "task1"async def task2(): await asyncio.sleep(1) print("task2 done") return "task2"async def task3(): await asyncio.sleep(1) print("task3 done") return "task3"async def main(): start = now() tasks = [task1(), task2(), task3()] # 1 # dones, pendings = await asyncio.wait(tasks) # for task in dones: # print("task result:", task.result()) """异步运行 异步输出""" # 2 # for task in asyncio.as_completed(tasks): # result = await task # print("task result:", result) """执行顺序=结果顺序""" # 3 result = await asyncio.gather(*tasks) print(result) """异步运行,同步输出,结果顺序和传参顺序一致""" print("耗时:", now() - start)asyncio.run(main())

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