美麗的湯：從HTML有序列表中提取href

Question

我正在嘗試使用BeautifulSoup python模塊從HTML有序列表中提取URL。我的代碼返回一個NONE值列表，其數量等於來自有序列表中的項目數，因此我知道我在文檔中的正確位置。我究竟做錯了什麼？

我從刮網址是http://www.dailykos.com/story/2013/04/27/1203495/-GunFAIL-XV 這裏有5個從HTML表50行（對於長度道歉）：

> `<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>` 

這裏是我的代碼：

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，該元素沒有href屬性。 a裏面的標籤做：

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'))