curriculum/challenges/english/blocks/learn-classes-and-objects-by-building-a-sudoku-solver/6606c2d203a8124c83b2234b.md
You need to check if a given number is not equal to the number in the specified column of the current row.
For this, replace pass with a generator expression that iterates over the range from 0 to 8 (inclusive), and for each row, evaluates whether the number at the specified row and column col on the board is different from num.
You should delete pass and create a generator expression (self.board[row][col] != num for row in range(9)).
({ test: () => assert(runPython(`_Node(_code).find_class("Board").find_function("valid_in_col").find_body().is_equivalent("(self.board[row][col] != num for row in range(9))")`)) })
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]
--fcc-editable-region--
def valid_in_col(self, col, 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)