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curriculum/challenges/english/blocks/learn-classes-and-objects-by-building-a-sudoku-solver/6606c05b5624a54ab85808fa.md

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--description--

As you can see, the output is False because 8 is already present in the first row of the board. Now change the 8 into a 7.

--hints--

You modify your print call to print the result of calling valid_in_row(0, 7) on gameboard.

js
({ test: () => assert(runPython(`_Node(_code).has_call("print(gameboard.valid_in_row(0, 7))")`)) })

--seed--

--seed-contents--

py
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

    def valid_in_row(self, row, num):
        return num not in self.board[row]

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)
--fcc-editable-region--
print(gameboard.valid_in_row(0, 8))
--fcc-editable-region--