单线程+异步协程

import asyncio
import aiohttp
import time
#回调函数：解析响应的数据
def callback(task):
    print("这是解析的回调")
    #获取到响应数据
    page_text = task.result()
    # print("进行解析",page_text)
    return "hhahah"
#定义一个特殊的函数，协程
async def get_page(url):
    #用aiohttp 发送请求 aiohttp支持异步
    async with aiohttp.ClientSession() as request:
        async with request.get(url=url) as response:
            page_text = await response.text() # read() json()
            return page_text
s = time.time()

tasks = []
urls = [‘https://www.baidu.com‘,
        ‘https://uland.taobao.com‘,
        ‘https://www.jd.com‘]
# 创建一个事件循环对象
loop = asyncio.get_event_loop()

for url in urls:
    c = get_page(url)
    task = asyncio.ensure_future(c)
    # 给任务对象绑定回调函数用于解析相应数据
    task.add_done_callback(callback)
    tasks.append(task)

# 蒋多个任务对象对应的列表注册到事件循环中
loop.run_until_complete(asyncio.wait(tasks))
print(time.time() - s)