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You shouldn't be using double-underscore variables. If you want to suggest that an instance variable is private, use a name with a single underscore.

You shouldn't be using double-underscore variables. If you want to suggest that an instance variable is private, use a name with a single underscore.

def __str__(self):
 return "\n".join(
 [''.join(
 ['#' if row[col] else '.' for col in row]
 ) for row in self._board]
 ) + "\n"

def __str__(self):
 return "\n".join(
 [''.join(
 ['#' if cell else '.' for cell in row]
 ) for row in self._board]
 ) + "\n"

board = Board.load('boardFile.dat')
# or...
# board = Board(15)
# board.fill(row=7, col=7)
game = GameOfLifeGenerator(board)
for _ in range(11):
 print(board)
 board = game.next()

board = Board.load('boardFile.dat')
game = GameOfLifeGenerator(board)
for _ in range(11):
 print(board)
 board = game.next()

Alternatively,

from itertools import islice
board = Board(15)
board.fill(row=7, col=7)
for state in islice(GameOfLifeGenerator(board), 11):
 print(state)