async await 协程的简单用法

https://blog.csdn.net/rhx_qiuzhi/article/details/124332114
https://docs.python.org/zh-cn/3/library/asyncio-task.html

• 官方教程
  https://docs.python.org/zh-cn/3.7/library/asyncio-eventloop.html

• 简单demo.py

async def washing1():
    await asyncio.sleep(3)
    print('小朋友的衣服洗完了')

async def washing2():
    await asyncio.sleep(2)
    print('爷爷奶奶的衣服洗完了')

async def washing3():
    await asyncio.sleep(5)
    print('爸爸妈妈的衣服洗完了')

#异步启动主函数
async def main():
    #调用方法一
    # tasks=[asyncio.create_task(washing1()),
    #        asyncio.create_task(washing2()),
    #        asyncio.create_task(washing3())]
    # done,pending=await asyncio.wait(tasks)
    # print('done', done,'pending', pending)
    #调用方法二
    tasks = [asyncio.ensure_future(washing1()),
            asyncio.ensure_future(washing2()),
            asyncio.ensure_future(washing3())]
    done,pending =await asyncio.wait(tasks)
    print('done', done,'pending', pending)
    # 运行方法三  gather #除了多任务外，还可以对任务进行分组。优先使用gather
    # tasks1 = [washing1(), washing2(), washing3()]
    # group1 = asyncio.gather(*tasks1)
    # done =await asyncio.gather(group1)
    # print('done',done)

if __name__=="__main__":
    startTime = time.time()
    loop = asyncio.get_event_loop()  # 创建一个事件循环
    try:
        loop.run_until_complete(main()) #完成事件循环，直到最后一个任务结束
    finally:
        loop.close() #结束事件循环
    print("所有IO任务总耗时: ",time.time()-startTime)

asyncio gather与wait的区别

https://zhuanlan.zhihu.com/p/76536655

aiohttp 异步http

https://blog.csdn.net/rhx_qiuzhi/article/details/124332114