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from guizero import App, Slider, Picture
def resize():
picture.resize(width.value, height.value)
app = App(layout="grid", width=550, height=200)
picture = Picture(app, image="guizero.gif", grid=[0,1])
width = Slider(app, command=resize, grid=[0,0], start=1, end=picture.width)
width.width = picture.width
width.value = picture.width
height = Slider(app, command=resize, horizontal=False, grid=[1,1], start=1, end=picture.height)
height.height = picture.height
height.value = picture.height
app.display()
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