title: How to square only the positive numbers in a list?
body: <p>I am trying to only square the positive numbers in a list. But when I try the code it squares all of them</p>
  
  <pre><code>def squarethis(numbers):
  for n in numbers:
      if n &gt; 0:
          return[n ** 2 for n in numbers]
  
  print(squarethis([1, 3, 5, -81]))
  </code></pre>
  
  <p>Why does it square all numbers? The if-statement should filter the negatives out right?</p>