<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update_scale(self, value):
 """ updates the scale of all actors in the plotter """

        self.plotter.set_scale(self.x_slider_group.value,
                               self.y_slider_group.value,
                               self.z_slider_group.value)