爬虫----异步---高性能爬虫----aiohttp 和asycio 的使用

import aiohttp
import asyncio

async def get_page(url):             
    async with aiohttp.ClientSession() as session:      #with 前面都要加async
        async with await session.get(url=url) as response:  # 有io阻塞的都要加await 
挂起
            page_text = await response.text() #read()  json()
            print(page_text)
start = time.time()
urls = [
    ‘http://127.0.0.1:5000/bobo‘,
    ‘http://127.0.0.1:5000/jay‘,
    ‘http://127.0.0.1:5000/tom‘,
    ‘http://127.0.0.1:5000/bobo‘,
    ‘http://127.0.0.1:5000/jay‘,
    ‘http://127.0.0.1:5000/tom‘,
    ‘http://127.0.0.1:5000/bobo‘,
    ‘http://127.0.0.1:5000/jay‘,
    ‘http://127.0.0.1:5000/tom‘
]
tasks = []
loop = asyncio.get_event_loop()
for url in urls:
    c = get_page(url)
    task = asyncio.ensure_future(c)
    tasks.append(task)
loop.run_until_complete(asyncio.wait(tasks))
print(‘总耗时：‘,time.time()-start)