title: appending empty nestled lists in python
body: <p>I am currently trying to add items to nested lists. I am trying to use the nested lists as queues so i need to able to append them independently. Why can I add to the nested list only when it is not empty? is there any way around this other than by checking to see if its empty and manually adding the first element? Code below. For reference, I want the output of picture #2</p>
  <p><a href="https://i.stack.imgur.com/Qa4Du.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Qa4Du.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/CIXLJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CIXLJ.png" alt="enter image description here" /></a></p>