pip install py-netty protobuf

import io

import sys

from typing import List, Union

from netty import 

from protobuf import 



class Client(TcpClient):

    def __init__(self, host: str, port: int):

        super().__init__(host, port)

        self.send_buffer = io.BytesBuffer()

        self.receive_buffer = io.BytesBuffer()



    def send(self, message: bytes):

        encoded_message = Varint32Encoder().encode(message)

        self.send_buffer.write(encoded_message)



    def receive(self):

        decoded_message = Varint32Decoder().decode(self.receive_buffer.read())

        return decoded_message



if __name__ == '__main__':

    host = 'localhost'

    port = 12345

    client = Client(host, port)

    message = b'Hello, world!'

    client.send(message)

    print(client.receive())