title: line = line.strip() TypeError: 'NoneType' object is not callable
body: <p>I am trying to find all num's in a list from an html using <code>beautifulsoup</code>:</p>
  
  <pre class="lang-py prettyprint-override"><code>import urllib
  from BeautifulSoup import *
  import re
  
  line = None
  url = raw_input('Enter - ')
  html = urllib.urlopen(url).read()
  
  soup = BeautifulSoup(html)
  
  # Retrieve all of the anchor tags
  tags = soup('span')
  for line in tags:
      line = line.strip()
      numlist = re.findall('[0-9]+' , tags)
  print numlist`
  </code></pre>
  
  <p>I'm getting a traceback: </p>
  
  <blockquote>
    <p>Traceback (most recent call last):   File "C:\Documents and
    Settings\mea388\Desktop\PythonSchool\new 12.py", line 14, in 
        line = line.strip() TypeError: 'NoneType' object is not callable</p>
  </blockquote>
  
  <p>I cannot understand why I'm getting a traceback.</p>