curriculum/challenges/english/blocks/learn-classes-and-objects-by-building-a-sudoku-solver/6606bbd52233b247cf0a56e4.md
Now, turn the 1 you modified earlier back into a 0 to restore the original board configuration. Then, delete your print call.
You should turn the first item of the first list of puzzle back into a zero.
({ test: () => assert(runPython(`_Node(_code).find_variable("puzzle").is_equivalent("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]]")`)) })
You should not have print(gameboard.find_empty_cell()) in your code.
({ test: () => assert.isFalse(runPython(`_Node(_code).has_call("print(gameboard.find_empty_cell())")`)) })
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--
puzzle = [
[1, 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)
print(gameboard.find_empty_cell())
--fcc-editable-region--