title: NoneType object is not callable__ beautiful soup
body: <p>This is my code so far</p>
  
  <pre><code># -*- encoding: utf-8 -*-
  
  import urllib2
  from BeautifulSoup import BeautifulSoup as bs
  import json
  
  
  data = urllib2.urlopen('http://www.jma.go.jp/en/yoho/320.html')
  
  html_doc = data.read()
  
  soup = bs(html_doc)
  
  weather = soup.find('table',attrs={'class':'forecast'})
  weather_res = weather.find_all('th')
  </code></pre>
  
  <p>Why I get NoneType error for this...</p>