title: None value in python dictionary
body: <p>Is it possible to check none value in dict</p>
  
  <pre><code>dict = {'a':'None','b':'12345','c':'None'}
  </code></pre>
  
  <p>My code </p>
  
  <pre><code>for k,v in d.items():
    if d[k] != None:
      print "good"
    else:
      print "Bad 
  </code></pre>
  
  <p>Prints three good after executing above code snippet.</p>
  
  <pre><code>good
  good
  good
  </code></pre>
  
  <p>Required:If value is None than not printing good for dict key a and c.</p>