title: Pass arg to function
body: <p>how do i pass an arg <code>10 9 - 5 +</code>, and receive an answer <code>6</code> through the command line? I have a function, but I'm not sure how to pass arguments to it in order to make it work.</p>
  
  <p>This is the function:</p>
  
  <pre><code>def polish_calc():
      polish = "10 9 - 5 +"
      print(int(polish[:2]) - int(polish[-7]) + int(polish[-3]))
  polish_calc()
  </code></pre>