def cursor_down(self, count=None):
        """Move cursor down the indicated # of lines in same column.
        Cursor stops at bottom margin.

        :param int count: number of lines to skip.
        """
        _top, bottom = self.margins or Margins(0, self.lines - 1)
        self.cursor.y = min(self.cursor.y + (count or 1), bottom)
Move cursor down the indicated # of lines in same column.
        Cursor stops at bottom margin.

        :param int count: number of lines to skip.