用urllib库获取某一个网站cookie的理解

• 所需库:urllib.request和http.cookiejar

import urllib.request
import http.cookiejar

• 步骤：

1. 声明一个cookieJar对象

cookie = http.cookiejar.cookieJar()
cookie = http.cookiejar.MozillacookieJar(cookie.txt)
#MozillacookieJar(cookie.txt)可将cookie保存

2.用HTTPCookieProcessor(cookie)处理器构建一个handler

handler = urllib.request.HTTPCookieProcessor(cookie)

3.用build_opener(handler)构建一个opener

opener = urllib.request.build_opener(handler)

4.用opener.open(url)打开

r = opener.open(url)

5.用cookie.save()保存获取的cookie

cookie.save(ignore_discard = True, ignore_expires = True)
#ignore_discard(丢弃）ignore_expires(文件协议失效)

• 完整代码

#cookies获取与保存
import urllib.request
import http.cookiejar

url = 'http://www.baidu.com'
filename = "cookie.txt"

cookie = http.cookiejar.MozillaCookieJar(filename)
handler = urllib.request.HTTPCookieProcessor(cookie)
opener = urllib.request.build_opener(handler)
r = opener.open(url)
print(type(cookie))
for c in cookie:
    print(c.name + '=' + c.value)

cookie.save(ignore_discard=True, ignore_expires=True)