Python-无法使用BeautifulSoup查找CSS类

我正在编写脚本以从网页收集天气数据。我的代码去如下：Python-无法使用BeautifulSoup查找CSS类

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right_now和feels_like印制精美，但是当涉及到td_base，它返回要么None或[]，这取决于是否使用.find或.find_all一个空列表。为了解释HTML源代码，我的代码能够找到itemprop="temperature-fahrenheit"和itemprop="feels-like-temperature-fahrenheit"，但在class_="wx-temperature"上失败。我很欣赏任何想法，为什么前两个会成功，但不是第三个。谢谢！

P.S。：下面是HTML源代码是相关（IMO）到手头的任务的摘录：

<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>

来源

2013-07-21 hakuna121

删除周围'：

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

来源

2013-07-21 03:29:35 falsetru

Python-无法使用BeautifulSoup查找CSS类

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