Simple python client-server

client.py

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("localhost", 50010))
msg_to_send = 'Hello world!'
bytes_to_send = msg_to_send.encode('utf-8')

print('Send to the server:', msg_to_send)
s.send(bytes_to_send)

bytes_from_server = s.recv(1024)
print('Bytes from server:', bytes_from_server)
msg_from_server = bytes_from_server.decode('utf-8')
print('Message from server:', msg_from_server)

server.py

import socketserver


class Handler(socketserver.BaseRequestHandler):
    def handle(self):
        bytes_from_client = self.request.recv(1024)
        print('Bytes from client:', bytes_from_client)
        msg = bytes_from_client.decode('utf-8')
        print('Message from client:', msg)
        self.request.send('OK'.encode('utf-8'))

if __name__ == '__main__':
    with socketserver.TCPServer(('localhost', 50010), Handler) as server:
        server.serve_forever()

Run a server: python3 server.py
Run a client: python3 client.py