协程使用基础教程

# -*- coding: UTF-8 -*-
import aiohttp
import asyncio
import platform
import ssl
import certifi  # 这个如果没有安装，那就pip install
# 事件循环策略有关, windows系统需要选择使用windows的事件循环策略
if 'Windows' in platform.platform():
    policy = asyncio.WindowsSelectorEventLoopPolicy()
    asyncio.set_event_loop_policy(policy)

async def fetch(client, url , headers , proxy):
    async with client.get(url, headers = headers ,proxy = proxy) as r:
        return await r.text()

async def main():
   timeout = aiohttp.ClientTimeout(10)
   # 获取ssl证书的位置
   ssl_context = ssl.create_default_context()
   ssl_context.load_verify_locations(certifi.where())
   # 自定义ssl的连接器
   connector = aiohttp.TCPConnector(ssl=ssl_context)
   client = aiohttp.ClientSession(timeout= timeout, connector = connector)
   url = 'http://httpbin.org/get'
   headers = {
       "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.193 Safari/537.36"
   }
   proxy = "http://123.24.42.45:15397"
   html = await fetch(client, url, headers, proxy)
   print(html)
   await client.close()

asyncio.run(main())