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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def draw(self, renderer):
 """ Draw the children """

        dpi_cor = renderer.points_to_pixels(1.)
        self.dpi_transform.clear()
        self.dpi_transform.scale(dpi_cor, dpi_cor)

        for c in self._children:
            c.draw(renderer)

        self.stale = False