python协程有多厉害？

　　爬一个××网站上的东西，测算了一下协程的速度提升到底有多大，网站链接就不放了。。。

import requests
from bs4 import BeautifulSoup as sb
import lxml
import time

url = ‘http://www.××××.com/html/part/index27_‘
url_list = []

start = time.time()

for i in range(2,47):
    print(‘get page ‘+str(i))
    headers = {‘User-Agent‘: ‘Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.78 Safari/537.36‘}
    res = requests.get((url+str(i)+‘.html‘), headers)
    res.encoding = ‘gb2312‘
    soup = sb(res.text, ‘lxml‘)
    div = sb(res.text, ‘lxml‘).find(‘div‘, class_="box list channel")
    for li in div.find_all(‘li‘):
        urls = (‘http://www.××××.com‘ + li.a.get(‘href‘))
        url_list.append(urls)
        print(urls)
print(url_list)
print(time.time()-start)

爬完用时 111.7 s。

来试试协程：

import requests
from bs4 import BeautifulSoup as sb
import lxml
import time
from gevent import monkey
import gevent

monkey.patch_all()

url = ‘http://www.231ka.com/html/part/index27_‘
url_list = []

for i in range(2,47):
    url_list.append(url+str(i)+‘.html‘)

def get(url):
    print(‘get data from :‘+url)
    headers = {
        ‘User-Agent‘: ‘Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.78 Safari/537.36‘}
    res = requests.get(url, headers)
    res.encoding = ‘gb2312‘
    soup = sb(res.text, ‘lxml‘)
    div = sb(res.text, ‘lxml‘).find(‘div‘, class_="box list channel")
    for li in div.find_all(‘li‘):
        ur = (‘http://www.231ka.com‘ + li.a.get(‘href‘))
        print(ur)

start = time.time()

task = []
for url in url_list:
    task.append(gevent.spawn(get,url))
gevent.joinall(task)

print(time.time()-start)

结果是： 55.6 s

也就是说在同样是单线程的情况下，采用了协程后可以使得时间缩减一半，而且仅仅是使用了python的第三方协程库实现的。

牛逼了