Validate Sudoku Board Rows Columns and Boxes in Python

def validate_sudoku(board):
    def is_valid_group(group):
        return sorted(group) == list(range(1, 10))

    def get_columns():
        return [[board[r][c] for r in range(9)] for c in range(9)]

    def get_boxes():
        boxes = []
        for box_row in range(0, 9, 3):
            for box_col in range(0, 9, 3):
                box = [
                    board[r][c]
                    for r in range(box_row, box_row + 3)
                    for c in range(box_col, box_col + 3)
                ]
                boxes.append(box)
        return boxes

    all_groups = board + get_columns() + get_boxes()
    return all(is_valid_group(group) for group in all_groups)


if __name__ == "__main__":
    valid_board = [
        [5, 3, 4, 6, 7, 8, 9, 1, 2],
        [6, 7, 2, 1, 9, 5, 3, 4, 8],
        [1, 9, 8, 3, 4, 2, 5, 6, 7],
        [8, 5, 9, 7, 6, 1, 4, 2, 3],
        [4, 2, 6, 8, 5, 3, 7, 9, 1],
        [7, 1, 3, 9, 2, 4, 8, 5, 6],
        [9, 6, 1, 5, 3, 7, 2, 8, 4],
        [2, 8, 7, 4, 1, 9, 6, 3, 5],
        [3, 4, 5, 2, 8, 6, 1, 7, 9],
    ]
    invalid_board = [row[:] for row in valid_board]
    invalid_board[0][0] = 1

    print(f"Valid board: {validate_sudoku(valid_board)}")
    print(f"Invalid board: {validate_sudoku(invalid_board)}")