How to increment all values in a matrix (list of lists) by n?

Question

I must create a function that is passed a matrix as an argument which then increments the value of each item in the matrix by n by using nested loops.

e.g if my matrix is [[8, 9], [4, 6], [7, 2]] and n = 1, I want the output to be [[9, 10], [5, 7], [8, 3]]

Answer 1

You can create a function to return a new list using a nested list comprehension:

def increment_by_n(lst, n):
    return [[col + n for col in row] for row in lst]

Usage:

>>> increment_by_n([[8, 9], [4, 6], [7, 2]], 1)
[[9, 10], [5, 7], [8, 3]]