def display_initialize(self):
        """Display 'please wait' message, and narrow build warning."""
        echo(self.term.home + self.term.clear)
        echo(self.term.move_y(self.term.height // 2))
        echo(self.term.center('Initializing page data ...').rstrip())
        flushout()

        if LIMIT_UCS == 0x10000:
            echo('\n\n')
            echo(self.term.blink_red(self.term.center(
                'narrow Python build: upperbound value is {n}.'
                .format(n=LIMIT_UCS)).rstrip()))
            echo('\n\n')
            flushout()
Display 'please wait' message, and narrow build warning.