Game of Life (tkinter version for Windows)

from tkinter import *
from tkinter import font
import time
import random

class GameOfLife(Frame):

	def __init__(self, parent):
		Frame.__init__(self, parent)
		self.parent = parent
		self.grid(row = 0, column = 0)
		self.size_x = 50
		self.size_y = 20
		self.cell_buttons = []
		self.generate_next = True
		self.initialUI()

	def initialUI(self):
		self.parent.title("Game of Life")
		self.title_frame = Frame(self.parent)
		self.title_frame.grid(row = 0, column = 0, columnspan = 4)
		self.titleFont = font.Font(family="Helvetica", size=14)
		title = Label(self.title_frame, text = "Conway's Game of Life", font = self.titleFont)
		title.pack(side = TOP)

		prompt = Label(self.title_frame, text = "When the game is stopped you can click the cells, then press Start Game. \
		            \nRules: Dead cells come alive when exactly 3 neighbor cells are alive. \
					\nLive cells stay alive when there are 2 or 3 live neighbor cells, else it dies")
		prompt.pack(side = BOTTOM)
		self.build_grid()
		self.start_button = Button(self.parent, text = "Start Game", command = self.simulate_game)
		self.start_button.grid(row = 1,column = 0)
		self.start_random_button = Button(self.parent, text = "Random Start", command = self.random_game)
		self.start_random_button.grid(row =1,column = 1)
		self.stop_button = Button(self.parent, text = "Stop Game", state = DISABLED, command = self.stop_game)
		self.stop_button.grid(row =1 , column = 2)

	def build_grid(self):
		self.game_frame = Frame(
			self.parent, width = self.size_x + 2, height = self.size_y + 2, borderwidth = 1, relief = SUNKEN)
		self.game_frame.grid(row = 2, column = 0, columnspan = 4)

		#instantiates buttons for choosing initial configuration
		self.cell_buttons = [[Button(self.game_frame, bg = "white", width = 2, height = 1) for i in range(self.size_x + 2)] for j in range(self.size_y + 2)]
		# creates 2d array of buttons for grid
		for i in range(1, self.size_y + 1):
			for j in range(1, self.size_x + 1):
				self.cell_buttons[i][j].grid(row = i, column = j, sticky = W+E)
				self.cell_buttons[i][j]['command'] = lambda i=i, j=j:self.cell_toggle(self.cell_buttons[i][j])

	def simulate_game(self):
		self.disable_buttons()
		buttons_to_toggle = []
		for i in range(1, self.size_y + 1):
			for j in range(1, self.size_x + 1):
				coord = (i, j)
				# if cell dead and has 3 neighbors, add coordinate to list of coords to toggle
				if self.cell_buttons[i][j]['bg'] == "white" and self.neighbor_count(i, j) == 3:
					buttons_to_toggle.append(coord)
				# if cell alive and does not have 2 or 3 neighbors,, add coordinate to list of coords to toggle
				elif self.cell_buttons[i][j]['bg'] == "black" and self.neighbor_count(i, j) != 3 and self.neighbor_count(i, j) != 2:
					buttons_to_toggle.append(coord)

		for coord in buttons_to_toggle:
			self.cell_toggle(self.cell_buttons[coord[0]][coord[1]])
        if self.generate_next:
			self.after(100, self.simulate_game)
		else:
			self.enable_buttons()

	def random_game(self):
		for i in range(1, self.size_y + 1):
			for j in range(1, self.size_x + 1):
				self.cell_buttons[i][j]['bg'] = "white" if random.randint(0,1) else "black"
		self.generate_next = True
		self.simulate_game()

	def disable_buttons(self):
		if self.cell_buttons[1][1] != DISABLED:
			for i in range(0, self.size_y + 2):
				for j in range(0, self.size_x + 2):
					self.cell_buttons[i][j].configure(state = DISABLED)
			self.stop_button.configure(state = NORMAL)
			self.start_random_button.configure(state = DISABLED)
			self.start_button.configure(state = DISABLED)

	def enable_buttons(self):
		for i in range(0, self.size_y + 2):
			for j in range(0, self.size_x + 2):
				self.cell_buttons[i][j].configure(state = NORMAL)

		self.stop_button.configure(state = DISABLED)
		self.start_button.configure(state = NORMAL)
		self.start_random_button.configure(state = NORMAL)
		self.generate_next = True

	def neighbor_count(self, x_coord, y_coord):
		count = 0
		for i in range(x_coord - 1, x_coord + 2):
			for j in range(y_coord - 1, y_coord + 2):
				if (i != x_coord or j != y_coord) and self.cell_buttons[i][j]['bg'] == "black":
					count += 1
		return count

	def cell_toggle(self, cell):
		if cell['bg'] == "white":
			cell['bg'] = "black"
		else:
			cell['bg'] = "white"

	def stop_game(self):
		self.generate_next = False

if __name__ == '__main__':
	root = Tk()
	game = GameOfLife(root)
	root.mainloop()