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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 select_previous(self):
 """Move to the previous status in the timeline."""

        self.footer.clear_message()

        if self.selected == 0:
            self.footer.draw_message("Cannot move beyond first toot.", Color.GREEN)
            return

        old_index = self.selected
        new_index = self.selected - 1

        self.selected = new_index
        self.redraw_after_selection_change(old_index, new_index)