# -*- coding:utf-8 -*-
import requests
import asyncio
import time
import aiohttp
from lxml import etree
'''
- aiohttp
- 是一个支持异步的网络请求模块
- pip install aiohttp
requests模块不支持异步
'''
urls = ['http://localhost:5000/bobo','http://localhost:5000/tom','http://localhost:5000/jay',]
# async def get_request(url):
# #requests是一个不支持异步的模块
# page_text = requests.get(url).text
# return page_text
async def get_request(url):
#实例化好一个请求对象
async with aiohttp.ClientSession() as sess:
#调用get发起请求,返回一个响应对象
#get/post(url,headers,params/data,prosy="http://ip:port")
async with await sess.get(url=url) as response:
#text()获取了字符串形式的响应数据
#read()获取byte类型的响应数据
page_text = await response.text()
return page_text
#解析函数的封装
def parse(t):
#获取请求到页面源码数据
page_text = t.result()
tree = etree.HTML(page_text)
parse_text = tree.xpath('//a[@id="feng"]/text()')[0]
print(parse_text) #可以写入本地
if __name__ == "__main__":
start = time.time()
tasks = []
for url in urls:
c = get_request(url)
task = asyncio.ensure_future(c)
task.add_done_callback(parse())
tasks.append(task)
loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.wait(tasks))
print('总耗时: ',time.time()-start)
