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curriculum/challenges/english/blocks/learn-classes-and-objects-by-building-a-sudoku-solver/6606bd3d02e86548d3ce1a0a.md

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--description--

Replace pass with an expression that checks if the number num is not already present in that row.

--hints--

You should replace pass with the expression num not in self.board[row].

js
({ test: () => assert(runPython(`_Node(_code).find_class("Board").find_function("valid_in_row").find_body().is_equivalent("num not in self.board[row]")`)) })

--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
--fcc-editable-region--
    def valid_in_row(self, row, num):
        pass
--fcc-editable-region--
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)