[Tutor] Still having trouble with my game of life algorithm

[Jerry Hill]

On 5/25/07, Matt Smith <matt at mattanddawn.orangehome.co.uk> wrote:
> def update_matrix(matrix):
>     matrix_updated = matrix

That line assigns the name matrix_updated to the same list-of-lists as
matrix.  Since lists are mutable objects, changing matrix_updated is
also changing matrix.  What you need is to bind matrix_updated to a
new copy of matrix instead.

At the top of your code add:
from copy import deepcopy

and replace the first line of update_matrix() with:
    matrix_updated = deepcopy(matrix)

After making that change, your code appears to run beautifully!

-- 
Jerry