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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_footer(self):
 """ Draw the key binds help bar at the bottom of the screen """

        n_rows, n_cols = self.term.stdscr.getmaxyx()
        window = self.term.stdscr.derwin(1, n_cols, self._row, 0)
        window.erase()
        window.bkgd(str(' '), self.term.attr('HelpBar'))

        text = self.FOOTER.strip()
        self.term.add_line(window, text, 0, 0)
        self._row += 1