Added sudoku mini-project

contrib/mini-projects/sudoku.py

@@ -0,0 +1,79 @@
+import random
+
+class Sudoku:
+    def __init__(self, grid):
+        self.grid = grid
+
+    @staticmethod
+    def generate_empty_grid():
+        return [[0 for _ in range(9)] for _ in range(9)]
+
+    @staticmethod
+    def is_valid_move(grid, row, col, num):
+        # Check if the number is already present in the row, column, or 3x3 subgrid
+        return (num not in grid[row] and
+                num not in (grid[i][col] for i in range(9)) and
+                num not in (grid[i][j] for i in range(row - row % 3, row - row % 3 + 3)
+                            for j in range(col - col % 3, col - col % 3 + 3)))
+
+    @staticmethod
+    def generate_sudoku():
+        grid = Sudoku.generate_empty_grid()
+        Sudoku.solve_sudoku(grid)
+        Sudoku.remove_cells(grid, random.randint(30, 45))  # Adjust the range for the number of empty cells
+        return grid
+
+    @staticmethod
+    def solve_sudoku(grid):
+        empty_cell = Sudoku.find_empty_cell(grid)
+        if not empty_cell:
+            return True
+        row, col = empty_cell
+        for num in random.sample(range(1, 10), 9):
+            if Sudoku.is_valid_move(grid, row, col, num):
+                grid[row][col] = num
+                if Sudoku.solve_sudoku(grid):
+                    return True
+                grid[row][col] = 0
+        return False
+
+    @staticmethod
+    def find_empty_cell(grid):
+        for i in range(9):
+            for j in range(9):
+                if grid[i][j] == 0:
+                    return i, j
+        return None
+
+    @staticmethod
+    def remove_cells(grid, num_cells_to_remove):
+        for _ in range(num_cells_to_remove):
+            row = random.randint(0, 8)
+            col = random.randint(0, 8)
+            if grid[row][col] != 0:
+                grid[row][col] = 0
+
+    @staticmethod
+    def print_grid(grid):
+        for row in grid:
+            print(" ".join(map(str, row)))
+
+def main():
+    print("Generating Sudoku puzzle...")
+    sudoku_grid = Sudoku.generate_sudoku()
+    print("Sudoku puzzle:")
+    Sudoku.print_grid(sudoku_grid)
+
+    user_input = input("\nWould you like to see the solution? (yes/no): ").strip().lower()
+    if user_input in ['yes', 'y']:
+        solved_grid = [row[:] for row in sudoku_grid]  # Create a copy of the grid to solve
+        if Sudoku.solve_sudoku(solved_grid):
+            print("Sudoku solution:")
+            Sudoku.print_grid(solved_grid)
+        else:
+            print("No solution found.")
+    else:
+        print("Solution not displayed.")
+
+if __name__ == "__main__":
+    main()