A Python script to both solve and generate Sudoku puzzle boards. Uses the Backtracking technique to effectively find the solution. Feel free to make changes :)
>>> import SudokuMaster
>>> board = SudokuMaster.makeBoard()
>>> SudokuMaster.printBoard(board)
>>>
[4, 5, 1, 7, 3, 8, 6, 9, 2]
[2, 6, 9, 4, 5, 1, 3, 8, 7]
[7, 3, 8, 2, 6, 9, 5, 1, 4]
[5, 9, 2, 3, 1, 4, 8, 7, 6]
[3, 1, 4, 6, 8, 7, 9, 2, 5]
[6, 8, 7, 5, 9, 2, 1, 4, 3]
[8, 4, 3, 9, 7, 6, 2, 5, 1]
[1, 2, 5, 8, 4, 3, 7, 6, 9]
[9, 7, 6, 1, 2, 5, 4, 3, 8]
>>> puzzle = SudokuMaster.makePuzzleBoard(board, "moderate")
>>> # "easy", "moderate", "difficult"
>>> SudokuMaster.printBoard(puzzle)
>>>
[0, 0, 0, 0, 0, 0, 0, 0, 2]
[0, 6, 9, 4, 0, 1, 0, 8, 0]
[0, 0, 0, 2, 6, 0, 5, 0, 0]
[5, 0, 0, 0, 0, 0, 8, 7, 6]
[0, 1, 0, 6, 8, 7, 0, 0, 0]
[0, 0, 0, 0, 9, 2, 0, 4, 3]
[8, 0, 3, 0, 0, 6, 2, 5, 0]
[0, 0, 0, 8, 4, 3, 0, 6, 0]
[0, 7, 6, 1, 2, 0, 4, 0, 0]
>>> if SudokuMaster.solveBoard(puzzle):
print("\n\n\nSolved Solution is: ")
SudokuMaster.printBoard(puzzle)
else:
print("No Solution Exist")
>>>
Solved Solution is:
[4, 5, 1, 7, 3, 8, 6, 9, 2]
[2, 6, 9, 4, 5, 1, 3, 8, 7]
[7, 3, 8, 2, 6, 9, 5, 1, 4]
[5, 9, 2, 3, 1, 4, 8, 7, 6]
[3, 1, 4, 6, 8, 7, 9, 2, 5]
[6, 8, 7, 5, 9, 2, 1, 4, 3]
[8, 4, 3, 9, 7, 6, 2, 5, 1]
[1, 2, 5, 8, 4, 3, 7, 6, 9]
[9, 7, 6, 1, 2, 5, 4, 3, 8]
>>> newBoardToSolve = [
[0, 0, 0, 0, 0, 0, 0, 0, 0]
[0, 8, 3, 0, 4, 2, 0, 1, 6]
[2, 4, 0, 0, 7, 6, 3, 0, 0]
[4, 5, 2, 0, 0, 7, 0, 8, 0]
[0, 3, 9, 2, 0, 4, 1, 0, 0]
[0, 7, 0, 9, 3, 0, 0, 0, 4]
[7, 1, 6, 0, 0, 3, 2, 0, 0]
[3, 0, 0, 4, 2, 5, 0, 7, 0]
[5, 0, 4, 0, 6, 0, 0, 0, 9]
]
>>> if SudokuMaster.solveBoard(newBoardToSolve):
print("\n\n\nSolved Solution is: ")
SudokuMaster.printBoard(newBoardToSolve)
else:
print("No Solution Exist")
>>>
Solved Solution is:
[1, 6, 7, 3, 8, 9, 4, 5, 2]
[9, 8, 3, 5, 4, 2, 7, 1, 6]
[2, 4, 5, 1, 7, 6, 3, 9, 8]
[4, 5, 2, 6, 1, 7, 9, 8, 3]
[8, 3, 9, 2, 5, 4, 1, 6, 7]
[6, 7, 1, 9, 3, 8, 5, 2, 4]
[7, 1, 6, 8, 9, 3, 2, 4, 5]
[3, 9, 8, 4, 2, 5, 6, 7, 1]
[5, 2, 4, 7, 6, 1, 8, 3, 9]Just Copy the SudokuMaster.py in your project and you are good to go
None, pure python code.
import SudokuMaster
board = SudokuMaster.makeBoard()
puzzle = SudokuMaster.makePuzzleBoard(board, "moderate")
SudokuMaster.printBoard(puzzle)
#puzzle is merely a 2-d array, try print(puzzle)
#feed any 2-d array to SudokuMaster.solveBoard to get the solution
if SudokuMaster.solveBoard(puzzle):
print("\n\n\nSolved Solution is: ")
SudokuMaster.printBoard(puzzle)
else:
print("No Solution Exist")MIT License
Copyright (c) 2017 Navdeesh Ahuja
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.