async协程嵌套

协程嵌套

import asyncio

import time

now = lambda: time.time()

async def do_some_work(x):
    print('Waiting: ', x)

    await asyncio.sleep(x)
    return 'Done after {}s'.format(x)
#将协程的工作内容放进一个函数里，将这个函数添加进事件循环
async def main():
    coroutine1 = do_some_work(1)
    coroutine2 = do_some_work(2)
    coroutine3 = do_some_work(4)

    tasks = [
        asyncio.ensure_future(coroutine1),
        asyncio.ensure_future(coroutine2),
        asyncio.ensure_future(coroutine3)
    ]

    dones, pendings = await asyncio.wait(tasks)

    for task in dones:
        print('Task ret: ', task.result())

start = now()
#将这个函数添加进事件循环
loop = asyncio.get_event_loop()
loop.run_until_complete(main())

print('TIME: ', now() - start)