title: Concatenate string to the end of all elements of a list in python
body: <p>I would like to know how to concatenate a string to the end of all elements in a list.</p>
  
  <p><strong>For example:</strong></p>
  
  <pre><code>List1 = [ 1 , 2 , 3 ]
  string = "a"
  
  output = ['1a' , '2a' , '3a']
  </code></pre>