Python - How to get a square matrix of order n (of a certain kind)?

Question

Python

The thing is, I don't understand what the picture should look like.
Given, say, 5 digits. - 1, 2,3,4,5. What should be the matrix? Too many passes. Explain, please

Answer 1

nxn matrix. Values ​​are indicated on the diagonals, 0 elsewhere.