Extract link from url using Beautifulsoup

问题

I am trying to get the web link of the following, using beautifulsoup

<div class="alignright single">
<a href="http://www.dailyhadithonline.com/2013/07/21/hadith-on-clothing-women-should-lower-their-garments-to-cover-their-feet/" rel="next">Hadith on Clothing: Women should lower their garments to cover their feet</a> &raquo;    </div>
</div>

My code is as follow

from bs4 import BeautifulSoup                                                                                                                                 
import urllib2                                                                                                
url1 = "http://www.dailyhadithonline.com/2013/07/21/hadith-on-clothing-the-lower-garment-should-be-hallway-between-the-shins/"

content1 = urllib2.urlopen(url1).read()
soup = BeautifulSoup(content1) 

nextlink = soup.findAll("div", {"class" : "alignright single"})
a = nextlink.find('a')
print a.get('href')

I get the following error, please help

a = nextlink.find('a')
AttributeError: 'ResultSet' object has no attribute 'find'

回答1:

Use .find() if you want to find just one match:

nextlink = soup.find("div", {"class" : "alignright single"})

or loop over all matches:

for nextlink in soup.findAll("div", {"class" : "alignright single"}):
    a = nextlink.find('a')
    print a.get('href')

The latter part can also be expressed as:

a = nextlink.find('a', href=True)
print a['href']

where the href=True part only matches elements that have a href attribute, which means that you won't have to use a.get() because the attribute will be there (alternatively, no <a href="..."> link is found and a will be None).

For the given URL in your question, there is only one such link, so .find() is probably most convenient. It may even be possible to just use:

nextlink = soup.find('a', rel='next', href=True)
if nextlink is not None:
    print a['href']

with no need to find the surrounding div. The rel="next" attribute looks enough for your specific needs.

As an extra tip: make use of the response headers to tell BeautifulSoup what encoding to use for a page; the urllib2 response object can tell you what, if any, character set the server thinks the HTML page is encoded in:

response = urllib2.urlopen(url1)
soup = BeautifulSoup(response.read(), from_encoding=response.info().getparam('charset'))

Quick demo of all the parts:

>>> import urllib2
>>> from bs4 import BeautifulSoup
>>> response = urllib2.urlopen('http://www.dailyhadithonline.com/2013/07/21/hadith-on-clothing-the-lower-garment-should-be-hallway-between-the-shins/')
>>> soup = BeautifulSoup(response.read(), from_encoding=response.info().getparam('charset'))
>>> soup.find('a', rel='next', href=True)['href']
u'http://www.dailyhadithonline.com/2013/07/21/hadith-on-clothing-women-should-lower-their-garments-to-cover-their-feet/'

回答2:

You need to unpack the list so Try this instead:

nextlink = soup.findAll("div", {"class" : "alignright single"})[0]

Or since there's only one match the find method also ought to work:

nextlink = soup.find("div", {"class" : "alignright single"})

来源：https://stackoverflow.com/questions/20469596/extract-link-from-url-using-beautifulsoup