python3 模拟登录v2ex实例讲解

# coding=utf-8 
import requests 
from bs4 import BeautifulSoup

headers = { 
'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/56.0.2924.87 Safari/537.36','origin': 'https://www.v2ex.com','referer': 'https://www.v2ex.com/signin','host': 'www.v2ex.com',} 
s = requests.Session() 
r = s.get('https://www.v2ex.com/signin',headers=headers) 
soup = BeautifulSoup(r.content,"html.parser")

#获取登录数据
once = soup.find('input',{'name': 'once'})['value']
name = soup.find('input',{'type': 'text','class': 'sl'})['name']
password = soup.find('input',{'type': 'password','class': 'sl'})['name']
login_data = {
name : 'xxx',password : 'xxx','once' : once,'next' : '/'
}

#登录 
s.post('https://www.v2ex.com/signin',login_data,headers=headers)