Sub matrix of a list of lists (without numpy)

Question

Suppose I have a matrix composed of a list of lists like so:

>>> LoL=[list(range(10)) for i in range(10)]
>>> LoL
[[0, 1, 2, 3, 4, 5, 6, 7,         


        

Answer 1

I dont know if its easier, but let me throw an idea to the table:

from itertools import product
r = (1+1, 4+1)
s = (2+1, 5+1)
array = [LoL[i][j] for i,j in product(range(*r), range(*s))]

This is a flattened version of the submatrix you want.