【Python3爬虫(四)】【urlib.request模块】【ssl认证+cookies(字符串类型转换、session)】

上一篇：【Python3爬虫(三)】【urlib.request模块】【cookie+Request】

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一、 ssl认证

03-requests_ssl.py

import requests
import urllib3

url = 'https://www.12306.cn/mormhweb/'
headers = {
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) '
                  'Chrome/70.0.3538.67 Safari/537.36 '
}

# 因为https是有第三方CA证书认证的
# 但是12306虽然是https,但是它不是CA证书, 他是自己颁布的证书
# 解决方法是:告诉 web忽略证书访问

# 移除认证后控制台总是抛出警告
# InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly
# advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
requests.packages.urllib3.disable_warnings()

# Python3访问HTTPS时移除SSL认证
response = requests.get(url=url, headers=headers, verify=False)
data = response.content.decode()

with open('03-ssl.html', 'w', encoding='utf-8') as f:
    f.write(data)

二、 cookies

2.1 字符串类型转换

04-requests_cookies.py

import requests

# 请求数据url
member_url = 'https://www.yaozh.com/member/'

headers = {
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) '
                  'Chrome/70.0.3538.67 Safari/537.36 '
}

# 'https://www.yaozh.com/member/'的headers里的cookie
# cookies的字符串
cookies = '_ga=GA1.2.1820447474.1535025127; MEIQIA_EXTRA_TRACK_ID=199Tty9OyANCXtHaSobJs67FU7J; ' \
          'WAF_SESSION_ID=7d88ae0fc48bffa022729657cf09807d; PHPSESSID=70kadg2ahpv7uuc8docd09iat4; ' \
          '_gid=GA1.2.133568065.1540383729; _gat=1; MEIQIA_VISIT_ID=1C1OdtdqpgpGeJ5A2lCKLMGiR4b; ' \
          'yaozh_logintime=1540383753; yaozh_user=381740%09xiaomaoera12; yaozh_userId=381740; ' \
          'db_w_auth=368675%09xiaomaoera12; UtzD_f52b_saltkey=ylH82082; UtzD_f52b_lastvisit=1540380154; ' \
          'UtzD_f52b_lastact=1540383754%09uc.php%09; ' \
          'UtzD_f52b_auth=f958AVKmmdzQ2CWwmr6GMrIS5oKlW%2BkP5dWz3SNLzr%2F1b6tOE6vzf7ssgZDjhuXa2JsO%2FIWtqd' \
          '%2FZFelWpPHThohKQho; yaozh_uidhas=1; yaozh_mylogin=1540383756; ' \
          'MEIQIA_EXTRA_TRACK_ID=199Tty9OyANCXtHaSobJs67FU7J; WAF_SESSION_ID=7d88ae0fc48bffa022729657cf09807d; ' \
          'Hm_lvt_65968db3ac154c3089d7f9a4cbb98c94=1535025126%2C1535283389%2C1535283401%2C1539351081%2C1539512967' \
          '%2C1540209934%2C1540383729; MEIQIA_VISIT_ID=1C1OdtdqpgpGeJ5A2lCKLMGiR4b; ' \
          'Hm_lpvt_65968db3ac154c3089d7f9a4cbb98c94=1540383761 '

# 需要的是字典类型，将cookies字符串类型转换为字典类型
cook_dict = {}
# 先用；拆分
cookies_list = cookies.split('; ')
for cookie in cookies_list:
    cook_dict[cookie.split('=')[0]] = cookie.split('=')[1]


# 字典推导式
cook_dict = {cookie.split('=')[0]: cookie.split('=')[1] for cookie in cookies.split('; ')}

response = requests.get(member_url, headers=headers, cookies=cook_dict)

data = response.content.decode()

with open('05-cookie.html', 'w', encoding='utf-8') as f:
    f.write(data)

2.2 session

05-requests_cookies2.py

import requests

# 请求数据url
member_url = 'https://www.yaozh.com/member/'

headers = {
    'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) '
                  'Chrome/70.0.3538.67 Safari/537.36 '
}
# session类可以自动保存cookies，可以理解为cookiesJar
session = requests.session()
# 1.代码登录
login_url = 'https://www.yaozh.com/login'
login_form_data = {
    'username': 'xiaomaoera12',
    'pwd': 'lina081012',
    'formhash': '54AC1EE419',
    'backurl': 'https%3A%2F%2Fwww.yaozh.com%2F',
}
login_response = session.post(login_url, data=login_form_data, headers=headers)
# print(login_response.content.decode())
# 2.登录成功之后，带着有效的cookies访问请求目标数据
data = session.get(member_url, headers=headers).content.decode()

with open('05-cookie2.html', 'w', encoding='utf-8') as f:
    f.write(data)

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