title: TypeError: unsupported operand type(s) for -: 'datetime.datetime' and 'int'
body: <p>I'm trying to build a chronometer but I'm having trouble calculating the delta_time</p>
  
  <pre><code>`def start():`
      start_time = datetime.datetime.now()
      print(start_time)
  
  def stop():
      stop_time = datetime.datetime.now()
      print(stop_time)
      delta_time = stop_time - start_time
  </code></pre>
  
  <p>When calling these functions i get:</p>
  
  <pre><code>2019-01-20 03:38:01.630833
  </code></pre>
  
  <p><code>2019-01-20 03:38:05.790672</code></p>
  
  <pre><code>File "test.py", line 15, in stop
      delta_time = stop_time - start_time
  TypeError: unsupported operand type(s) for -: 'datetime.datetime' and 'int'
  </code></pre>
  
  <p>I've looked around but found nothing that worked. I have no idea what might be causing this problem.</p>