I would have answered Shannon 's question about the use of lists of lists more simply: Data stru...

[G+_Lee Crocker]

I would have answered Shannon's question about the use of lists of lists more simply: Data structures are supposed to model things in the real world. Some things in the real world are lists of lists.

 

Here's some list-mangling code to play with:

 

https://github.com/lcrocker/Coding-101/blob/master/lists.py

https://github.com/lcrocker/Coding-101/blob/master/lists.py