asyncio.sleep 和 time.sleep 的区别

time.sleep是针对整个线程，整个线程会挂起，不再执行任何操作。

asyncio.sleep是针对当前协程而言，告诉事件循环：请去执行别的操作，相当于模拟了一次网络IO，不会阻塞其他协程的执行。

import time
import asyncio

async def hello():
    print('Hello ...')
    await asyncio.sleep(5)
    # time.sleep(5)
    print('... World!')

async def main():
    await asyncio.gather(hello(), hello())

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

运行结果：

Hello ...
Hello ...
... World!
... World!

import time
import asyncio

async def hello():
    print('Hello ...')
    # await asyncio.sleep(5)
    time.sleep(5)
    print('... World!')

async def main():
    await asyncio.gather(hello(), hello())

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

运行结果：

Hello ...
... World!
Hello ...
... World!