How to create lists of 3x3 sudoku block in python

Question

I need help creating a list for each of the 9 3x3 blocks in sudoku. so I have a list of lists representing the original sudoku board (zero means empty):

board=[[         


        

Answer 1

You can do this with a combination of reshape and transpose when you use numpy.

edit - sorry - hit enter too soon:

import numpy as np
board=[[2,0,0,0,0,0,0,6,0],
       [0,0,0,0,7,5,0,3,0],
       [0,4,8,0,9,0,1,0,0],
       [0,0,0,3,0,0,0,0,0],
       [3,0,0,0,1,0,0,0,9],
       [0,0,0,0,0,8,0,0,0],
       [0,0,1,0,2,0,5,7,0],
       [0,8,0,7,3,0,0,0,0],
       [0,9,0,0,0,0,0,0,4]]

t = np.array(board).reshape((3,3,3,3)).transpose((0,2,1,3)).reshape((9,9));
print t

Output:

[[2 0 0 0 0 0 0 4 8]
 [0 0 0 0 7 5 0 9 0]
 [0 6 0 0 3 0 1 0 0]
 [0 0 0 3 0 0 0 0 0]
 [3 0 0 0 1 0 0 0 8]
 [0 0 0 0 0 9 0 0 0]
 [0 0 1 0 8 0 0 9 0]
 [0 2 0 7 3 0 0 0 0]
 [5 7 0 0 0 0 0 0 4]]