title: How to parse same argument twice or more than once to python script?
body: <p>I have written a python script which uses argeparse module for handling arguments. 
  e.g. </p>
  
  <pre><code>Test_Dual.py -g Linux
  </code></pre>
  
  <p>Now, I want to give it two options for same argument, like</p>
  
  <pre><code>Test_Dual.py -g Linux -g ESX -g Windows
  </code></pre>
  
  <p>How can I do that?</p>