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