How to resize an animated gif to fit the window

[kwekey]

Hi, I am able to display animated gif using pyglet using below code, but I 
would like the image to stretch and fit the window as i resize the window.
Any one can help me?

import pyglet
# pick an animated gif file you have in the working directory

CODE: SELECT ALL
def animate(str):
    ag_file = str
    animation = pyglet.resource.animation(ag_file)
    sprite = pyglet.sprite.Sprite(animation)
    # create a window and set it to the image size
    win = pyglet.window.Window(width=sprite.width, height=sprite.height)
  
    @win.event
    def on_draw():
        win.clear()
        sprite.draw()

    pyglet.app.run()

animate("***.gif")


CODE: SELECT ALL
win = pyglet.window.Window(width=sprite.width, height=sprite.height)

Above line will resize the window to fit the animated gif but i want it the 
other way, that is the gif to fit the windows size..
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