Python Beautiful Soup 网页抓取特定数字

Question

关于this page每个团队的最终得分(数字)具有相同的类(class)名称class="finalScore"。

当我计算客队的最终得分(顶部)时，代码可以毫无问题地调用该数字。如果...favLastGM = 'A'

当我尝试调用主队的最终比分(底部)时，代码给出了错误。如果...favLastGM = 'H'

下面是我的代码:

import pickle
import math
import urllib2
from lxml import etree
from bs4 import BeautifulSoup
from urllib import urlopen

#Last Two Game info Home [H] or Away [A]
favLastGM = 'A' #Higher week number 2

#Game Info (Favorite) Last Game Played - CBS Sports (Change Every Week)
favPrevGMInfoUrl = 'http://www.cbssports.com/nfl/gametracker/boxscore/NFL_20140914_NE@MIN'
favPrevGMInfoHtml = urlopen(favPrevGMInfoUrl).read()
favPrevGMInfoSoup = BeautifulSoup(favPrevGMInfoHtml)
if favLastGM == 'A': #This Gives Final Score of Away Team - Away Score
    favScore = favPrevGMInfoSoup.find_all("td", { "class" : "finalScore" })
elif favLastGM == 'H':
    favScore = favPrevGMInfoSoup.find_all("td", { "class" : "finalScore" })[1]
else:
    print("***************************************************")
    print("NOT A VALID ENTRY - favLastGM  !")
    print("***************************************************")


print ("Enter: Total Points Allowed from Favored Team Defense for last game played: "),
print favScore[0].text

这是我在 favLastGM = 'H' 时收到的错误

Traceback (most recent call last): File "C:/Users/jcmcdonald/Desktop/FinalScoreTest.py", line 26, in print favScore[0].text File "C:\Python27\lib\site-packages\bs4\element.py", line 905, in getitem return self.attrs[key] KeyError: 0

Answer 1

class="finalScore"只有两个元素，第一个是主队得分，第二个是客队得分:

>>> from urllib import urlopen
>>> from bs4 import BeautifulSoup
>>> 
>>> favPrevGMInfoUrl = 'http://www.cbssports.com/nfl/gametracker/boxscore/NFL_20140914_NE@MIN'
>>> 
>>> favPrevGMInfoSoup = BeautifulSoup(urlopen(favPrevGMInfoUrl))
>>> score = [item.get_text() for item in favPrevGMInfoSoup.find_all("td", {"class": "finalScore"})]
>>> score
[u'30', u'7']

仅供引用，您可以使用 CSS selector 而不是 .find_all("td", {"class": "finalScore"}) : .select("td.finalScore").