title: Python functions returning none for some reason
body: <p>I'm having some issues with these python functions. Whenever I run them, it saying function by_three is returning none. Any help would be appreciated.</p>
  
  <pre><code>def cube(number):
   result = number**3
   return result
  
  def by_three(number):
   if number%3 == 0:
    cube(number)
   else:
    return False 
  </code></pre>