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我正在编写一个脚本来从网页收集天气数据。我的代码如下：

import urllib.request
from bs4 import BeautifulSoup

# open the webpage and assign the content to a new variable
base = urllib.request.urlopen('http://www.weather.com/weather/today/Washington+DC+20006:4:US')
f = base.readlines()
f = str(f)


soup = BeautifulSoup(f)

rn_base = soup.find(itemprop="temperature-fahrenheit")
right_now = rn_base.string
print(right_now)

fl_base = soup.find(itemprop="feels-like-temperature-fahrenheit")
feels_like = fl_base.string
print(feels_like)

td_base = soup.find_all('class_="wx-temperature"')
print(td_base)

所以打印很好right_now，feels_like但是当涉及到 时td_base，它会返回Noneor []，一个空列表取决于是否使用.findor .find_all。关于 HTML 源代码的解释，我的代码能够找到itemprop="temperature-fahrenheit"and itemprop="feels-like-temperature-fahrenheit"，但在class_="wx-temperature". 对于为什么前两个会成功但第三个不会成功的任何想法，我将不胜感激。谢谢！

PS：这是与手头任务相关（IMO）的html源代码的摘录：

<div class="wx-data-part wx-first">
<div class="wx-temperature"><span itemprop="temperature-fahrenheit">87</span><span class="wx-degrees">&deg;<span class="wx-unit">F</span></span></div>
<div class="wx-temperature-label">FEELS LIKE
<span itemprop="feels-like-temperature-fahrenheit">93</span>&deg;</div>
</div>
<div class="wx-data-part">
<div class="wx-temperature">94<span class="wx-degrees">&deg;</span></div>
<div class="wx-temperature-label">HIGH AT 3:25 PM</div>
</div>
<div class="wx-data-part">
<div class="wx-temperature">76<span class="wx-degrees">&deg;</span></div>
<div class="wx-temperature-label">LOW</div>
</div>
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1 回答 1

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Remove surrounding ':

td_base = soup.find_all(class_="wx-temperature")
于 2013-07-21T03:29:35.100 回答