Python获取协程返回值的四种方式详解 Python获取协程返回值的四种方

介绍
源码
依次执行结果

介绍获取协程返回值的四种方式：
1、通过ensure_future获取，本质是future对象中的result方
2、使用loop自带的create_task，获取返回值
3、使用callback, 一旦await地方的内容运行完，就会运行callback
4、使用partial这个模块向callback函数中传入值

源码

import asynciofrom functools import partialasync def talk(name):print(f"talk function run.")await asyncio.sleep(0.1)return f"{name} talk!"async def sleep(name):print(f"sleep function run.")await asyncio.sleep(0.1)return f"{name} sleep!"def callback(name):print(f"主动抛出接收：{name}")if __name__ == "__main__":# 通过ensure_future获取，本质是future对象中的result方法# loop = asyncio.get_event_loop()# get_future1 = asyncio.ensure_future(talk("Dog"))# get_future2 = asyncio.ensure_future(sleep("Cat"))# loop.run_until_complete(get_future1)# loop.run_until_complete(get_future2)# print(get_future1.result())# print(get_future2.result())# 使用loop自带的create_task，获取返回值# loop = asyncio.get_event_loop()# task1 = loop.create_task(talk("Dog"))# task2 = loop.create_task(sleep("Cat"))# loop.run_until_complete(task1)# loop.run_until_complete(task2)# print(task1.result())# print(task2.result())# 使用callback, 一旦await地方的内容运行完，就会运行callback# loop = asyncio.get_event_loop()# task1 = loop.create_task(talk("Dog"))# task2 = loop.create_task(sleep("Cat"))# task1.add_done_callback(callback)# task2.add_done_callback(callback)# loop.run_until_complete(task1)# loop.run_until_complete(task2)# print(task1.result())# print(task2.result())# 使用partial这个模块向callback函数中传入值loop = asyncio.get_event_loop()task1 = loop.create_task(talk("Dog"))task2 = loop.create_task(talk("Cat"))task1.add_done_callback(partial(callback))task2.add_done_callback(partial(callback))loop.run_until_complete(task1)loop.run_until_complete(task2)print(task1.result())print(task2.result())

依次执行结果通过ensure_future获取，本质是future对象中的result方法