The second version of my GUI snake in python using tkinter

snake.py

import time
import tkinter
import random

window = tkinter.Tk()
canvas = tkinter.Canvas(window, bg="black", height=320, width=320)
window.wm_title("Press any key to start")
canvas.pack()
canvas.update()

ingame = False
positions = []
score = 0
framerate = 0.1
apple = (100, 160)


def spawnApple():
    i = positions[0]
    while i in positions:
        i = 20 * random.randint(0, 15), 20 * random.randint(0, 15)
    return i


def appendSnake():
    last = snake[-1].position
    action = snake[-1].action[-1]
    if action == 'Left':
        snake.append(Part((last[0] + 20, last[1])))
    elif action == 'Right':
        snake.append(Part((last[0] - 20, last[1])).move(action))
    elif action == 'Up':
        snake.append(Part((last[0], last[1] + 20)))
    elif action == 'Down':
        snake.append(Part((last[0], last[1] - 20)))


class Part:
    def __init__(self, position):
        self.action = []
        self.position = position
        positions.append(position)

    def move(self, action):
        self.action.append(action)
        return self

    def next(self):
        if snake[-1] == self:
            return
        return snake[snake.index(self) + 1]

    def execute(self):
        if not self.action:
            return
        action = self.action[0]
        positions.remove(self.position)
        if action == 'Up':
            self.position = (self.position[0], self.position[1] - 20)
        if action == 'Down':
            self.position = (self.position[0], self.position[1] + 20)
        if action == 'Left':
            self.position = (self.position[0] - 20, self.position[1])
        if action == 'Right':
            self.position = (self.position[0] + 20, self.position[1])
        positions.append(self.position)
        if self.next() is not None:
            self.next().move(action)
        if len(self.action) > 1:
            self.action.remove(action)


snake = [Part((80, 20)), Part((60, 20)), Part((40, 20)), Part((20, 20)), Part((00, 20))]


def KeyboardInput(evt):
    global ingame
    if ingame:
        snake[0].move(evt.keysym)
    else:
        ingame = True
        snake[0].move('Right')


window.bind('<Key>', KeyboardInput)


def NewFrame():
    global framerate, apple, score
    canvas.delete('all')
    canvas.create_rectangle(apple[0], apple[1], apple[0] + 20, apple[1] + 20, fill='red')
    part = snake[0].position

    if part == apple:
        apple = spawnApple()
        appendSnake()

        score = score + 1
        window.wm_title(score)
    if part[0] < 0 or part[0] > 300 or part[1] < 0 or part[1] > 300 or len(positions) != len(set(positions)):
        window.destory()
    if ingame:
        for s in snake:
            s.execute()
            canvas.create_rectangle(s.position[0], s.position[1], s.position[0] + 20, s.position[1] + 20, fill='white')

    canvas.update()
    time.sleep(framerate)


while True:
    NewFrame()