Sudoku Checker

Sudoku Checker is a Python class that allows you to validate whether a given Sudoku puzzle is correct according to the rules of Sudoku.

Introduction

Sudoku is a popular logic-based number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids (also known as "boxes" or "regions") contains all the digits from 1 to 9 without repetition.

The Sudoku Checker Python class provided here allows you to verify if a given Sudoku puzzle is valid, following the rules of Sudoku. It checks for duplicates in each row, column, and the 3x3 subgrids.

How to Use

1. Create a 9x9 Sudoku grid as a list of lists (2D list) in your Python script or module.

2. Instantiate the SudokuChecker class with the Sudoku grid as the argument.

3. Call the check() method of the SudokuChecker instance to verify the validity of the Sudoku puzzle.

4. The check() method returns True if the Sudoku puzzle is valid, and False otherwise.

Example:

# Create a sample Sudoku grid
sudoku = [
    [2, 6, 7, 8, 3, 9, 5, 0, 4],
    [9, 0, 3, 5, 1, 0, 6, 0, 0],
    [0, 5, 1, 6, 0, 0, 8, 3, 9],
    [5, 1, 9, 0, 4, 6, 3, 2, 8],
    [8, 0, 2, 1, 0, 5, 7, 0, 6],
    [6, 7, 4, 3, 2, 0, 0, 0, 5],
    [0, 0, 0, 4, 5, 7, 2, 6, 3],
    [3, 2, 0, 0, 8, 0, 0, 5, 7],
    [7, 4, 5, 0, 0, 3, 9, 0, 1]
]

# Instantiate SudokuChecker with the Sudoku grid
checker = SudokuChecker(sudoku)

# Check if the Sudoku puzzle is valid
is_valid = checker.check()

# Print the result
if is_valid:
    print("The Sudoku puzzle is valid.")
else:
    print("The Sudoku puzzle is invalid.")