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Sudoku_Solver.py
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Sudoku_Solver.py
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from random import randint, shuffle
empty_board = [
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0,0]
]
numberList=[1,2,3,4,5,6,7,8,9]
def fill_board(board):
find = find_empty(board)
if not find:
return True
else:
row,col = find
shuffle(numberList)
for i in numberList:
if check_valid(board,i,(row,col)):
board[row][col] = i
if fill_board(board):
return True
board[row][col] = 0
return False
def generate_sudoku(board,level):
counter = 20
fill_board(board)
print_board(board)
while level > 0 :
row = randint(0,len(board)-1)
col = randint(0,len(board)-1)
while board[row][col] == 0:
row = randint(0,len(board)-1)
col = randint(0,len(board)-1)
backup = board[row][col]
board[row][col] = 0
copy_board = []
for i in range(0,len(board)):
copy_board.append([])
for j in range(0,len(board)):
copy_board[i].append(board[i][j])
if not solve_sudoku(copy_board) & counter > 0 :
board[row][col] = backup
counter -= 1
else :
level -=1
print("Level: ",level)
def print_board(board):
print("")
print("- - - - - - - - - - - -")
print("")
for i in range(len(board)):
if i % 3 == 0 and i != 0 :
print("- - - - - - - - - - - -")
for j in range(len(board)):
if j % 3 == 0 and j != 0:
print(" | ", end="")
print(board[i][j], end="")
if j != 8:
print(" ", end = "")
else:
print("")
print("")
print("- - - - - - - - - - - -")
print("")
def find_empty(board):
for i in range(len(board)):
for j in range(len(board[i])):
if board[i][j] == 0:
return (i,j)
return None
def check_valid(board, num, pos):
#Check column
for i in range(len(board)):
if board[i][pos[1]] == num and pos[0] != i:
return False
#Check row
for i in range(len(board[0])):
if board[pos[0]][i] == num and pos[1] != i:
return False
#Check 3x3 box:
box_x = pos[1]//3
box_y = pos[0]//3
for i in range(box_y * 3, box_y * 3 + 3):
for j in range(box_x * 3, box_x * 3 + 3):
if board[i][j] == num and (i,j) != pos:
return False
return True
def solve_sudoku(board):
find = find_empty(board)
if not find:
return True
else:
row, col = find
for i in range(1,10):
if check_valid(board, i, (row, col)):
board[row][col] = i
if solve_sudoku(board):
return True
board[row][col] = 0
return False
print_board(empty_board)
generate_sudoku(empty_board,20)
print_board(empty_board)
solve_sudoku(empty_board)
print_board(empty_board)