#Сервер
import socket
from threading import Thread

def handler(client_socket, cli_address):
    print(client_address, 'was connected')
    while 1:
        recieve_message = client_socket.recv(1024)
        client_socket.send(recieve_message.upper())

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind(('127.0.0.1', 5000))
print('server starts')
server_socket.listen(1)
while 1:
    client_socket, client_address = server_socket.accept()
    Thread(target=handler, args=(client_socket, client_address)).start()
#-----------------------------------------
#Клиент
import socket

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('127.0.0.1', 5000))
while 1:
    message = input()
    client_socket.send(message.encode())
    recieve_message = client_socket.recv(1024)
    print(recieve_message.decode())