def grow(self, dx=50, dy=50):
Penguin.grow(self, dx, dy)
w, h = interpreter.size
w += 50
h += 25
interpreter.resize((w, h))
interpreter.set_modal_events()
def shrink(self, dx=50, dy=50):
Penguin.shrink(self, dx, dy)
w, h = interpreter.size
w -= 50
h -= 25
interpreter.resize((w, h))
interpreter.set_modal_events()
