title: Adding a string to a string in a list
body: <p>I have a list containing various strings, and I want to be able to choose a particular element in the list, and concatenate it with a new string.</p>
  
  <p>I thought this might do it:</p>
  
  <pre><code>checklist = [[0] + 'test' for [0] in checklist]
  </code></pre>
  
  <p>But it doesn't work. Any suggestions?</p>