网络爬虫：requests模块应用8-session会话保持

#requests.session():维持会话,可以让我们在跨请求时保存某些参数


import requests

#实例化session
session = requests.session()

#目标url
url = 'https://www.douban.com/accounts/login'

form_data = {
    'source': 'index_nav',
    'form_email': 'xxx',
    'form_password': 'xxx',
    'captcha-solution': 'stamp',
    'captcha-id': 'b3dssX515MsmNaklBX8uh5Ab:en'
}

#设置请求头
req_header = {
    'User-Agent':'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36',
}

#使用session发起请求
response = session.post(url,headers=req_header,data=form_data)

if response.status_code == 200:

    #访问个人主页：
    url = 'https://www.douban.com/people/175417123/'

    response = session.get(url,headers = req_header)

    if response.status_code == 200:

        with open('douban3.html','w') as file:

            file.write(response.text)