python3用BeautifulSoup用limit来获取指定数量的a标签 

# -*- coding:utf-8 -*-
#python 2.7
#XiaoDeng
#http://tieba.baidu.com/p/2460150866
#标签操作


from bs4 import BeautifulSoup
import urllib.request
import re


#如果是网址，可以用这个办法来读取网页
#html_doc = "http://tieba.baidu.com/p/2460150866"
#req = urllib.request.Request(html_doc)  
#webpage = urllib.request.urlopen(req)  
#html = webpage.read()



html="""
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title" name="dromouse"><b>The Dormouse's story</b></p>
<p class="story">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" id="xiaodeng"><!-- Elsie --></a>,
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
<a href="http://example.com/lacie" class="sister" id="xiaodeng">Lacie</a>
and they lived at the bottom of a well.</p>
<p class="story">...</p>
"""
soup = BeautifulSoup(html, 'html.parser')   #文档对象


#用limit来获取指定数量的a标签
for k in  soup.find_all("a", {"class": "sister"}, limit=2):
    print(k)

result：

.<a class="sister" href="http://example.com/elsie" id="xiaodeng"><!-- Elsie --></a>
<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>
[Finished in 0.2s]

posted @ 2016-11-13 22:00  Xiao|Deng  阅读(2739)  评论(0)  编辑  收藏  举报