code: def display_initialize(self):
          
          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()
docs: Display 'please wait' message, and narrow build warning.