test.py

from solver import *

board1 = [
        [7, 8, 0, 4, 0, 0, 1, 2, 0],
        [6, 0, 0, 0, 7, 5, 0, 0, 9],
        [0, 0, 0, 6, 0, 1, 0, 7, 8],
        [0, 0, 7, 0, 4, 0, 2, 6, 0],
        [0, 0, 1, 0, 5, 0, 9, 3, 0],
        [9, 0, 4, 0, 6, 0, 0, 0, 5],
        [0, 7, 0, 3, 0, 0, 0, 1, 2],
        [1, 2, 0, 0, 0, 7, 4, 0, 0],
        [0, 4, 9, 2, 0, 6, 0, 0, 7]
]

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

print("Board :")
print_board(board)
solve(board)
print("Solution :")
print_board(board)