美汤抛出“索引错误”
美汤抛出“索引错误”
提问于 2013-09-24 18:54:16
我正在使用Python2.7和BeautifulSoup3.2抓取一个网站。我对这两种语言都很陌生，但从文档中我得到了一点开始。
我正在阅读下一篇文档：http://www.crummy.com/software/BeautifulSoup/bs3/documentation.html#contents http://thepcspy.com/read/scraping-websites-with-python/
我现在所做的和拥有的(部分失败)：
# Import the classes that are needed
import urllib2
from BeautifulSoup import BeautifulSoup
# URL to scrape and open it with the urllib2
url = 'http://www.wiziwig.tv/competition.php?competitionid=92&part=sports&discipline=football'
source = urllib2.urlopen(url)
# Turn the saced source into a BeautifulSoup object
soup = BeautifulSoup(source)
# From the source HTML page, search and store all <td class="home">..</td> and it's content
hometeamsTd = soup.findAll('td', { "class" : "home" })
# Loop through the tag and store only the needed information, being the home team
hometeams = [tag.contents[1] for tag in hometeamsTd]
# From the source HTML page, search and store all <td class="home">..</td> and it's content
awayteamsTd = soup.findAll('td', { "class" : "away" })
# Loop through the tag and store only the needed information, being the away team
awayteams = [tag.contents[1] for tag in awayteamsTd]tag.contents hometeamsTd的内容如下所示：
[
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'Harkemase Boys', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-6077" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'RKC Waalwijk', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-427" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'Dutch KNVB Beker', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-6758" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'PSV', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-3" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'Ajax', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-2" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'Dutch KNVB Beker', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-6758" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'SC Heerenveen', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-14" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'Feyenoord', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-9" />],
[<img class="flag" src="/gfx/flags/nl.gif" alt="nl" />, u'Dutch KNVB Beker', <img src="/gfx/favourite_off.gif" alt="fav icon" class="fav off" id="team-6758" />]
]tag.contents awayteamsTd的内容如下所示：
[
[u'Away-team'],
[<img src="/gfx/favourite_off.gif" class="fav off" alt="fav icon" id="team-13" />, u'NEC', <img class="flag" src="/gfx/flags/nl.gif" alt="nl" />],
[<img src="/gfx/favourite_off.gif" class="fav off" alt="fav icon" id="team-11" />, u'Heracles', <img class="flag" src="/gfx/flags/nl.gif" alt="nl" />],
[<img src="/gfx/favourite_off.gif" class="fav off" alt="fav icon" id="team-428" />, u'Stormvogels Telstar', <img class="flag" src="/gfx/flags/nl.gif" alt="nl" />],
[<img src="/gfx/favourite_off.gif" class="fav off" alt="fav icon" id="team-419" />, u'FC Volendam', <img class="flag" src="/gfx/flags/nl.gif" alt="nl" />],
[<img src="/gfx/favourite_off.gif" class="fav off" alt="fav icon" id="team-7" />, u'FC Twente', <img class="flag" src="/gfx/flags/nl.gif" alt="nl" />],
[<img src="/gfx/favourite_off.gif" class="fav off" alt="fav icon" id="team-415" />, u'FC Dordrecht', <img class="flag" src="/gfx/flags/nl.gif" alt="nl" />]
]我试图解决的问题，但还没有完全解决的是：
- 代码
awayteams = [tag.contents[1] for tag in awayteamsTd]通过一个错误：IndexError: list index out of range。这当然是正确的，因为正如您在awayteamsTd，的tag.contents输出中看到的，有第一个条目[u'Away-team']。这就是它失败的原因。但是我如何删除/跳过这个呢？ - 在家庭团队中，所有输出都正常工作，但我想排除文本荷兰KNVB Beker发生的情况。
回答 2
Stack Overflow用户
回答已采纳
发布于 2013-09-24 19:08:16
问题是“离开”单元格(列名)在td中，其中包含"away“类：
<thead class="title">
...
<tr class="sub">
...
<td>Home-team</td>
<td></td>
<td class="away">Away-team</td>
<td class="broadcast">Broadcast</td>
</tr>
</thead>
</thead>只需使用切片跳过它：
awayteamsTd = soup.findAll('td', { "class" : "away" })[1:]此外，如果要将Dutch KNVB Beker排除在主队列表之外，请向列表理解表达式添加一个条件：
hometeams = [tag.contents[1] for tag in hometeamsTd if tag.contents[1] != 'Dutch KNVB Beker']Stack Overflow用户
发布于 2013-09-24 19:06:54
awayteams = []
for tag in awayteamsTd:
if len(tag.contents) > 1:
awayteams.append(tag.contents[1])页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/18989742
复制相关文章
相似问题
腾讯云开发者
