Help with a code

Question

How do you turn this...

x="A 16,B 17,C 18"

into this?...

z=[["A","16"],["B","17"],["C","18"]]

This attached code is my try. It'll explain a bit more.

https://code.sololearn.com/czruZCa4PX53/?ref=app

Answer 1

https://code.sololearn.com/cg4zP3pNU7ve/?ref=app
Now?

Answer 2

List comprehension is also possible:

y = [u.split(" ") for u in x.split(",")]