协程+IO切换+小爬虫

from gevent import monkey
monkey.patch_all()

import gevent
import requests

def f1(url):
    print(f'GET:{url}')
    msg = requests.get(url)
　　# 获取的是网站的数据长度
    print(len(msg.content))

gevent.joinall([
    gevent.spawn(f1, 'https://www.python.org'),
    gevent.spawn(f1, 'https://www.github.com'),
    gevent.spawn(f1, 'https://www.yahoo.com')
])