View of /life.py

from time import sleep
import sys

EMPTY = ' '
POPULATED = 'o'
width = 80
height = 23

def showBoard(board, verbose=False):
	str = ''
	for x in range(len(board)):
		for y in range(len(board[x])):
			if not verbose:
				sys.stdout.write(board[x][y])
			else:
				print '(', x, y, ')', repr(board[x][y])

def init(width, height):
	board = []
	for x in range(height):
		board.append([])
		for y in range(width):
			board[x].append(EMPTY)
	return board

def neighbors(board, x, y):
	count = 0
	for x in range(x - 1, x + 1):
		for y in range(y - 1, y + 1):
			if not x < 0 and not y < 0:
				if board[x][y] == POPULATED:
					count += 1
	return count - 1

def update(board):
	for x in range(len(board)):
		for y in range(len(board[x])):
			count = 0
			cell = board[x][y]
			count = neighbors(board, x, y)
			if cell == EMPTY and count == 3:
				board[x][y] = POPULATED
			if cell == POPULATED and count < 2:
				board[x][y] = EMPTY
			if cell == POPULATED and count > 3:
				board[x][y] = EMPTY

def prompt(board):
	prompting = True
	while prompting:
		sys.stdout.write('life> ')
		line = sys.stdin.readline()
		line = line[:-1]
		args = line.split(' ')
		cmd = args[0]
		if len(args) > 2:
			x = args[1]
			y = args[2]
			xi = int(x)
			yi = int(y)

			if cmd == 'peek':
				print '(%(x)s, %(y)s): %(val)s' % {'x': x, 'y': y, 'val': board[xi][yi]}
			if cmd == 'pop':
				board[xi][yi] = POPULATED
			if cmd == 'kill':
				board[xi][yi] = EMPTY
			if cmd == 'neighbors':
				print neighbors(board, xi, yi)
		if cmd == 'clear':
			board = init(len(board), len(board[x]))
		if cmd == 'go':
			prompting = False
		if cmd == 'next':
			update(board)
		if cmd == 'show':
			showBoard(board)
		if cmd == 'showv':
			showBoard(board, verbose=True)
		if cmd == 'help':
			print '''peek x y:\tshow the value at location x y
pop x y:\tpopulate the value at location x y
kill x y:\tkill the organism at location x y
neighbors x y:\tshow the number of neighbors at x y
clear:\twipe out the board
go:\tresume execution
next:\titerate the board once
show:\tshow the current state of the board
showv:\tshow the current state of the board with coordinate listings
help:\tthis text'''

def main(board):
	count = 0
	while True:
		count += 1
		showBoard(board)
		print 'Generation', count
		update(board)
		sleep(1)

board = init(width, height)
board[0][0] = POPULATED
board[0][1] = POPULATED

while True:
	try:
		main(board)
	except:
		prompt(board)