[Pyglet] pyglet freezing

[Windspar]

Example

import pyglet
from pyglet.window import key

window = pyglet.window.Window()
image = your image data here
sprite = pyglet.sprite.Sprite(image, 10, 10)
speed = 3

@window.event
def on_draw():
    window.clear()
    sprite.draw()

@window.event
def on_key_press(symbol, mod):
    if symbol == key.RIGHT:
        sprite.x += speed

    if symbol == key.LEFT:
        sprite.x -= speed

def update(delta):
    sprite.y += delta * 40
    if sprite.y + sprite.height / 2 > window.height:
        sprite.y -= window.height

pyglet.clock.schedule_interval(update, 1 / 60)
pyglet.app.run()