学习笔记 urllib

第一步：

get

# -*- coding:utf-8  -*-
# 日期：2018/5/15 19:39
# Author:小鼠标
from urllib import request

url = 'http://news.sina.com.cn/guide/'
response = request.urlopen(url)  #返回http对象
web_data = response.read().decode('utf-8')  #响应内容
web_status = response.status                #响应状态码
print(web_status,web_data)

post

# -*- coding:utf-8  -*-
# 日期：2018/5/15 19:39
# Author:小鼠标
from urllib import request,parse

url = 'http://news.sina.com.cn/guide/'
#post表单提交的内容
data = [
    ('name','xiaoshubiao'),
    ('pwd','xiaoshubiao')
]
login_data = parse.urlencode(data).encode('utf-8')
response = request.urlopen(url,data = login_data)  #返回http对象
web_data = response.read().decode('utf-8')  #响应内容
web_status = response.status                #响应状态码
print(web_status,web_data)

第二步：伪装浏览器

# -*- coding:utf-8  -*-
# 日期：2018/5/15 19:39
# Author:小鼠标
from urllib import request,parse

url = 'http://news.sina.com.cn/guide/'
req = request.Request(url)
req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 UBrowser/6.2.3964.2 Safari/537.36')
req.add_header('Accept','text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8')
response = request.urlopen(req)
web_data = response.read().decode('utf-8')  #响应内容
web_status = response.status                #响应状态码
print(web_status,web_data)

第三步：使用代理ip

# -*- coding:utf-8  -*-
# 日期：2018/5/15 19:39
# Author:小鼠标
from urllib import request,parse

url = 'http://news.sina.com.cn/guide/'
req = request.Request(url)
#使用代理ip
proxy = request.ProxyHandler({'http':'221.207.29.185:80'})
opener = request.build_opener(proxy, request.HTTPHandler)
request.install_opener(opener)

req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 UBrowser/6.2.3964.2 Safari/537.36')
req.add_header('Accept','text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8')
response = request.urlopen(req)
web_data = response.read().decode('utf-8')  #响应内容
web_status = response.status                #响应状态码
print(web_status,web_data)

第四步：内容解析

　　可以使用封装好的BeautifulSoup，也可以使用re正则来匹配，原理都差不多。