def set_application(self, app, callback=None):
        """
        Set ``CommandLineInterface`` instance for this connection.
        (This can be replaced any time.)

        :param cli: CommandLineInterface instance.
        :param callback: Callable that takes the result of the CLI.
        """
        assert isinstance(app, Application)
        assert callback is None or callable(callback)

        self.cli = CommandLineInterface(
            application=app,
            eventloop=self.eventloop,
            output=self.vt100_output)
        self.callback = callback

        # Create a parser, and parser callbacks.
        cb = self.cli.create_eventloop_callbacks()
        inputstream = InputStream(cb.feed_key)

        # Input decoder for stdin. (Required when working with multibyte
        # characters, like chinese input.)
        stdin_decoder_cls = getincrementaldecoder(self.encoding)
        stdin_decoder = [stdin_decoder_cls()]  # nonlocal

        # Tell the CLI that it's running. We don't start it through the run()
        # call, but will still want _redraw() to work.
        self.cli._is_running = True

        def data_received(data):
            """ TelnetProtocolParser 'data_received' callback """
            assert isinstance(data, binary_type)

            try:
                result = stdin_decoder[0].decode(data)
                inputstream.feed(result)
            except __HOLE__:
                stdin_decoder[0] = stdin_decoder_cls()
                return ''

        def size_received(rows, columns):
            """ TelnetProtocolParser 'size_received' callback """
            self.size = Size(rows=rows, columns=columns)
            cb.terminal_size_changed()

        self.parser = TelnetProtocolParser(data_received, size_received)
dataset/ETHPy150Open jonathanslenders/python-prompt-toolkit/prompt_toolkit/contrib/telnet/server.py/TelnetConnection.set_application