I tried to solve assignments by using list/dict comprehensions as much as possible. My favorite built-in library is itertools is also used frequently. No external library is required.
DISCLAIMER
Those are my own programming assginment answers. If you are studying the course and looking for a hint or suggestion for your current stuck task, this is not the right place. In other words, you have to solve the assignments yourselves beforing looking at someone else's full answers. Besides, I am not resposible for your grade if you use this code.