title: Python cannot concatenate 'str' and 'datetime.timedelta' objects
body: <p>I have this code, but I got an error and could not find a soulution to the problem. I was trying to get a time and then plus i hour becuase i live in europe.</p>
  
  <p>Here is my code:
  <code>plus_one_hour = "21:00:00" + timedelta(hours=2)</code></p>
  
  <p>And the error:
  <code>TypeError: cannot concatenate 'str' and 'datetime.timedelta' objects</code></p>