title: Adding a score from a list in python programming
body: <p>This is my code:</p>
  
  <pre><code> aliens = ['red_alien', 'blue_alien', 'blue_alien', 'green_alien', 
  'red_alien', 'red_alien', 'red_alien', 'blue_alien', 'blue_alien', 
  'green_alien'] 
  
  current_score = 0
  
  for alien in aliens:
      if 'red_alien' in aliens:
          current_score += 5
  
      elif 'green_alien' in aliens:
          current_score += 10
  
      elif 'blue_alien' in aliens:
          current_score += 20
  
  print(current_score)
  </code></pre>
  
  <p>Currently, I'm unsure why the numbers aren't adding up correctly when the code is being run. </p>