Learn Classes and Objects by Building a Sudoku Solver - Step 21

Python
1

Tell us what’s happening:

Hi, can anyone tell me what is wrong with this step? and how to do this step? I don’t understand.

Your code so far

class Board:
    def __init__(self, board):
        self.board = board

    def find_empty_cell(self):
        for row, contents in enumerate(self.board):
            try:
                col = contents.index(0)
                return row, col
            except ValueError:
                pass
        return None

puzzle = [
  [0, 0, 2, 0, 0, 8, 0, 0, 0],
  [0, 0, 0, 0, 0, 3, 7, 6, 2],
  [4, 3, 0, 0, 0, 0, 8, 0, 0],
  [0, 5, 0, 0, 3, 0, 0, 9, 0],
  [0, 4, 0, 0, 0, 0, 0, 2, 6],
  [0, 0, 0, 4, 6, 7, 0, 0, 0],
  [0, 8, 6, 7, 0, 4, 0, 0, 0],
  [0, 0, 0, 5, 1, 9, 0, 0, 8],
  [1, 7, 0, 0, 0, 6, 0, 0, 5]
]

gameboard = Board(puzzle)

# User Editable Region

print(gameboard(find_empty_cell(self)))


# User Editable Region

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Challenge Information:

Learn Classes and Objects by Building a Sudoku Solver - Step 21

2

find_empty_cell is a method of the gameboard object, so you need to call the method of the object.

https://www.geeksforgeeks.org/define-and-call-methods-in-a-python-class/

3

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