import asyncio

import time

async def get_html(url):

    print("start get url")

    await asyncio.sleep(2) # 不能使用time.sleep(),这样的话是同步，就不是异步；await就相当于yield from

    print("end get url")

if __name__ == "__main__":

    start_time = time.time()

    loop = asyncio.get_event_loop()

    tasks = [get_html("http://www.imooc.com") for i in range(10)]

　　loop.run_until_complete(asyncio.wait(tasks)) #loop.run_until_complete将task放到loop中，进行事件循环, 这里必须传入的是一个list

print(time.time()-start_time)