title: Can sys.argv handle optional arguments?
body: <pre><code>from sys import argv
  script, lira_cbt, [eur_hedge] = argv
  
  if eur_hedge == None:
      #Do x
  else:
      #Do y
  </code></pre>
  
  <p>I want it to be able to run with just lira_cbt as an argument (doing x), or with both lira_cbt and eur_hedge (doing y). Can this be achieved with sys.argv?</p>