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curriculum/challenges/english/blocks/learn-classes-and-objects-by-building-a-sudoku-solver/6606b0d602d1e33e81bcef0d.md

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--description--

You need to locate the empty cell, which is filled with the number zero.

Replace pass with a variable col and assign it a call to .index() on contents, passing 0 as the argument.

--hints--

You should replace pass with a variable col and assign it contents.index(0).

js
({ test: () => assert(runPython(`_Node(_code).find_class("Board").find_function("find_empty_cell").find_for_loops()[0].find_bodies()[0].is_equivalent("col = contents.index(0)")`)) })

--seed--

--seed-contents--

py
class Board:
    def __init__(self, board):
        self.board = board
--fcc-editable-region--
    def find_empty_cell(self):
        for row, contents in enumerate(self.board):
            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)