美丽的汤：从HTML有序列表中提取href

Question

我正在尝试使用BeautifulSoup python模块从HTML有序列表中提取URL。我的代码返回一个NONE值列表，其数量等于来自有序列表中的项目数，因此我知道我在文档中的正确位置。我究竟做错了什么？

我从刮网址是http://www.dailykos.com/story/2013/04/27/1203495/-GunFAIL-XV 这里有5个从HTML表50行（对于长度道歉）：

> `<div id="body" class="article-body"> 
<ol> 
<li><a href="http://www.wacotrib.com/news/city_of_waco/waco_police/grandfather-s-wound-is-a-gunshot-police-say/article_aeccbf93-4f81-5c3f-a304-bc91f6ba45a8.html">WACO, TX</a>, 3/18/13: Police responding to a domestic disturbance call found a man struggling to restrain his grandson, who was agitated and holding an AR-15. The cops shot grandpa. But that would totally never happen in a crowded theater.</li> 
<li><a href="http://grossepointe.patch.com/articles/grosse-pointe-park-police-make-several-arrests">GROSSE POINTE PARK, MI</a>, 4/06/13: Grosse Pointe Park police arrested a 20-year-old Detroit man April 6 after he accidentally shot a 9mm handgun into the floor of a home in the 1000 block of Beaconsfield. The man was trying to make the gun safe when it discharged.</li> 
<li><a href="http://ottawaherald.com/news/041613shooting">OTTAWA, KS</a>, 4/13/13: No one was injured when a “negligent” rifle shot rang out Saturday night inside a residence in the 1600 block of South Cedar Street in Ottawa. Dylan Spencer, 22, Ottawa, was arrested by Ottawa police about 7 p.m. on suspicion of unlawfully discharging an AR-15 rifle in his apartment, according to a police report. <a href="https://www.facebook.com/OttawaHerald/posts/000000000000000?comment_id=656061&amp;reply_comment_id=656512&amp;total_comments=3">The bullet</a> exited his apartment, passed through both walls of an occupied apartment and lodged into a utility pole. But of course, Dylan didn't think the gun was loaded. So it's cool.</li> 
<li><a href="http://www.kobi5.com/component/zoo/item/klamath-falls-man-dead-after-a-shooting.html">KLAMATH FALLS, OR</a>, 4/13/13: An investigation into the shooting death of Lee Roy Myers, 47, has been ruled accidental. The Klamath County Major Crimes Team was called to investigate a shooting on Saturday, April 13. An autopsy concluded the cause of death was an accidental, self-inflicted handgun wound.</li> 
<li><a href="http://westhampton-hamptonbays.patch.com/groups/police-and-fire/p/accidental-weapon-discharge">SOUTHAMPTON, NY</a>, 4/13/13: The report states that the detective visited the home and interviewed the man, who legally owned the Ruger 10/22 rifle. The man said he was cleaning the rifle when it accidentally discharged into his big toe. When the rifle was pointed in a downward angle, inertia caused the firing pin to strike the primer, which caused the rifle to fire, according to the incident report. The detective advised the man on safety techniques while cleaning his rifle. (Step one: unload it.)</li>` 

这里是我的代码：

page= urllib2.urlopen(url) 
soup = BeautifulSoup(page) 
li=soup.select("ol > li") 
for link in li: 
    print (link.get('href')) 

Answer 1

您正在迭代li元素，该元素没有href属性。 a里面的标签做：

import urllib2 
from bs4 import BeautifulSoup 

url = "http://www.dailykos.com/story/2013/04/27/1203495/-GunFAIL-XV" 

page = urllib2.urlopen(url).read() 
soup = BeautifulSoup(page) 
li = soup.select("ol > li > a") 
for link in li: 
    print(link.get('href'))