title: Character repeating in a string
body: <p>can you please tell me how to get every character in a string repeated using the for loop in python?my progress is as far as :</p>
  
  <pre><code>def double(str):
      for i in range(len(str)):
          return i * 2
  </code></pre>
  
  <p>and this returns only the first letter of the string repeated</p>