title: How to pass None keyword as command line argument
body: <p>I am trying to pass <code>None</code> keyword as a command line parameter to a script as follows, if I explicity mention <code>Category=None</code> it works but the moment I switch to <code>sys.argv[1]</code> it fails, any pointers on how to fix this?</p>
  
  <pre><code>category = None --&gt; works
  #category=sys.argv[1] --&gt; doesn't work 
  </code></pre>
  
  <p>so I tried as below which still didn't work</p>
  
  <pre><code>  if sys.argv[1].strip()==None:
      category = None
  else:
      category=sys.argv[1].strip()
  </code></pre>
  
  <p>Command line passage:</p>
  
  <pre><code> script.py None
  </code></pre>