012 Python 爬虫项目1

# Python 爬虫项目1
　　● Python 网页请求
　　　　requests
　　　　　　POST
　　　　　　GET

　　　　网页状态码

1 # -*- coding: UTF-8 -*-
2 from bs4 import BeautifulSoup
3 import requests
4 
5 url = "http://www.baidu.com"
6 unknow = requests.get(url)
7 print(type(unknow))
8 print(unknow)

　　　　通过标签匹配内容

 1 # -*- coding: UTF-8 -*-
 2 from bs4 import BeautifulSoup
 3 import requests
 4 
 5 url = "http://zz.ganji.com/fang1/"
 6 r = requests.get(url)
 7 soup = BeautifulSoup(r.text,'lxml')
 8 for item in soup.find_all('dd'):
 9     if item['class'] == ['dd-item','title']:
10         #print(item)
11         print(item.a.string)
12         print("----------------------------------------------------")

　　　　通过浏览器复制 copy selector

 1 # -*- coding: UTF-8 -*-
 2 from bs4 import BeautifulSoup
 3 import requests
 4 
 5 url = "http://zz.ganji.com/fang1/"
 6 r = requests.get(url)
 7 soup = BeautifulSoup(r.text,'lxml')
 8 
 9 #价格获取
10 title = soup.select('dl > dd.dd-item.info > div.price > span.num')
11 print(title)
12     
13 title2 = soup.select('dl > dd.dd-item.size > span.first.js-huxing')
14 print(title2)

1 title = soup.select('dl > dd.dd-item.info > div.price > span.num')
2 print(title)
3 print(type(title[0]))

　　title 的类型还是标签 Tag

　　　　soup.body.div.div.a 方式获取

1 # -*- coding: UTF-8 -*-
2 from bs4 import BeautifulSoup
3 import requests
4 
5 url = "http://zz.ganji.com/fang1/"
6 r = requests.get(url)
7 soup = BeautifulSoup(r.text,'lxml')
8 print(soup.body.div.div.a)

 1 from bs4 import BeautifulSoup
 2 import requests
 3 
 4 def isdiv(tag):
 5     return tag.name == 'div'
 6 
 7 url = "http://zz.ganji.com/fang1/"
 8 r = requests.get(url)
 9 soup = BeautifulSoup(r.text,'lxml')
10 
11 value = soup.find_all(isdiv)
12 print(value)

　　　　python 使用代理发送网页请求

1 import requests   
2 proxies = { "http": "http://10.10.1.10:3128", "https": "http://10.10.1.10:1080", }   
3 requests.get("http://example.org", proxies=proxies)