Snake

import random
import curses
s = curses.initscr()
curses.curs_set(0)
sh, sw = s.getmaxyx()
w = curses.newwin(sh, sw, 0, 0)
w.keypad(1)
w.timeout(100)
snk_x = sw/4
snk_y = sh/2
snake = [
[snk_y, snk_x],
[snk_y, snk_x-1],
[snk_y, snk_x-2]
]
food = [int(sh/2), int(sw/2)]
w.addch(food[0], food[1], curses.ACS_PI)
key = curses.KEY_RIGHT
while True:
    next_key = w.getch()
    key = key if next_key == -1 else next_key

    if snake[0][0] in [0,sh] or snake[0][1] in [0, sw] or snake[0] in snake[1:]:
        curses.endwin()
        quit()

    new_head = [snake[0][0], snake[0][1]]

    if key == curses.KEY_DOWN:
        new_head[0] += 1
    if key == curses.KEY_UP:
        new_head[0] -= 1
    if key == curses.KEY_LEFT:
        new_head[1] -= 1
    if key == curses.KEY_RIGHT:
        new_head[1] += 1

    snake.insert(0, new_head)

    if snake[0] == food:
        food = None
    while food is None:
        nf = [
        random.randint(1, sh-1),
        random.randint(1, sw-1)
        ]
        food = nf if nf not in snake else None
        w.addch(int(food[0]), int(food[1]), curses.ACS_PI)
    else:
        tail = snake.pop()
        w.addch(int(tail[0]), int(tail[1]), ' ')
        w.addch(int(snake[0][0]), int(snake[0][1]), curses.ACS_CKBOARD)