El server

client.py

import socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_addres = ('localhost', 10000)
print("Conectando al puerto {}".format(server_addres[1]))
sock.connect(server_addres)

try:
    msg = input("Mensaje: ").encode()
    sock.sendall(msg)
    # Para recibir del server
    # sock.recv(19)
finally:
    sock.close()

server.py

import socket

server_address = ('localhost', 10000)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind(server_address)

sock.listen(1)


def run_server():
    while True:
        print("Waiting...")
        connection, client_address = sock.accept()
        try:
            data = connection.recv(19)
            print("Se ha recibido un mensaje de "
                  "'{de}'\nMESANJE: '{msg}'".format(de=client_address,
                                                    msg=data))
        finally:
            connection.close()


if __name__ == "__main__":
    run_server()