title: Calling function in python 3
body: <p>Adding three variables through score function</p>
  
  <p>How can I call my function? Here I want to add all three variables. Why doesn´t it show the output?</p>
  
  <pre><code> def score(x,y,z):
          x == 1
          y == 2
          z == 3
          return (x+y+z)
  </code></pre>