code: def example_repl(self, text, example, start_index, continue_flag):
          
          if start_index:
              start_index = start_index + 1
              cmd = ' '.join(text.split()[:start_index])
              example_cli = CommandLineInterface(
                  application=self.create_application(
                      full_layout=False),
                  eventloop=create_eventloop())
              example_cli.buffers['example_line'].reset(
                  initial_document=Document(u'{}\n'.format(
                      add_new_lines(example)))
              )
              while start_index < len(text.split()):
                  if self.default_command:
                      cmd = cmd.replace(self.default_command + ' ', '')
                  example_cli.buffers[DEFAULT_BUFFER].reset(
                      initial_document=Document(
                          u'{}'.format(cmd),
                          cursor_position=len(cmd)))
                  example_cli.request_redraw()
                  answer = example_cli.run()
                  if not answer:
                      return "", True
                  answer = answer.text
                  if answer.strip('\n') == cmd.strip('\n'):
                      continue
                  else:
                      if len(answer.split()) > 1:
                          start_index += 1
                          cmd += " " + answer.split()[-1] + " " +\
                                 u' '.join(text.split()[start_index:start_index + 1])
              example_cli.exit()
              del example_cli
          else:
              cmd = text
  
          return cmd, continue_flag
docs: REPL for interactive tutorials