BeautifulSoup嵌套使用fina_all的例子

#!/usr/bin/env python
#coding:utf-8
from bs4 import BeautifulSoup
import urllib
import re

"""
结构分析

      ">
          ">
        ">
        
		
		
			          
		
		
			://www.cnpythoner.com/" rel="nofollow">首页 
		
		
			
		
		
			://www.cnpythoner.com/catalog.asp?cate=11">入门教程 
		
		
			
		
		
			://www.cnpythoner.com/catalog.asp?cate=4">练习题 
		
		
			
		
		
			://www.cnpythoner.com/catalog.asp?cate=1">python教程 
		
		
			
		
		
			://www.cnpythoner.com/catalog.asp?cate=2">django教程 
		
		
			
		
		
			://www.cnpythoner.com/catalog.asp?cate=15">seo应用 
		
		
			
		
		
			://www.cnpythoner.com/catalog.asp?cate=16">linux 
		
		
			
		
		
			://www.cnpythoner.com/catalog.asp?cate=17">测试应用 
		
		
			
		
		
			://www.cnpythoner.com/pythonbook.html" target="_blank">书籍推荐 
		
		
			
		
		
			://www.cnpythoner.com/pythondown/pythondown.html" target="_blank">环境下载 
		
		
			"""
		
		
			
		
		
			def url_info(url):
		
		
			    page = urllib.urlopen(url) 
		
		
			    soup = BeautifulSoup(page)
		
		
			    tag=soup.find_all('div',{'id':'divNavBar'})
		
		
			    #print list 
		
		
			    for i in tag:
		
		
			        #print i.find_all('li')
		
		
			        url_list=i.find_all('li')
		
		
			        for j in url_list:
		
		
			            #print j
		
		
			            print j.a['href']
		
		
			       
		
		
			if __name__=="__main__": 
		
		
			     url_info('')

://www.cnpythoner.com/" rel="nofollow">首页

://www.cnpythoner.com/catalog.asp?cate=11">入门教程

://www.cnpythoner.com/catalog.asp?cate=4">练习题

://www.cnpythoner.com/catalog.asp?cate=1">python教程

://www.cnpythoner.com/catalog.asp?cate=2">django教程

://www.cnpythoner.com/catalog.asp?cate=15">seo应用

://www.cnpythoner.com/catalog.asp?cate=16">linux

://www.cnpythoner.com/catalog.asp?cate=17">测试应用

://www.cnpythoner.com/pythonbook.html" target="_blank">书籍推荐

://www.cnpythoner.com/pythondown/pythondown.html" target="_blank">环境下载
"""

def url_info(url):
    page = urllib.urlopen(url)
    soup = BeautifulSoup(page)
    tag=soup.find_all('div',{'id':'divNavBar'})
    #print list
    for i in tag:
        #print i.find_all('li')
        url_list=i.find_all('li')
        for j in url_list:
            #print j
            print j.a['href']

if __name__=="__main__":
     url_info('')

输出结果：

http://www.cnpythoner.com/
http://www.cnpythoner.com/catalog.asp?cate=11
http://www.cnpythoner.com/catalog.asp?cate=4
http://www.cnpythoner.com/catalog.asp?cate=1
http://www.cnpythoner.com/catalog.asp?cate=2
http://www.cnpythoner.com/catalog.asp?cate=15
http://www.cnpythoner.com/catalog.asp?cate=16
http://www.cnpythoner.com/catalog.asp?cate=17
http://www.cnpythoner.com/pythonbook.html
http://www.cnpythoner.com/pythondown/pythondown.html