SERVER 
import socket

tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = ('localhost', 81)
tcp_socket.bind(server_address)
tcp_socket.listen(1)

while True:
    print("Waiting for connection")
    connection, client = tcp_socket.accept()
    try:
        print("Connected to client IP: {}".format(client))
        while True:
            data = connection.recv(32)
            print("Received data: {}".format(data))
            if not data:
                break
    finally:
        connection.close()

CLIENT 
import socket

tcp_socket = socket.create_connection(('localhost', 81))

try:
    data = str.encode('Hi. I am a TCP client sending data to the server')
    tcp_socket.sendall(data)
finally:
    print("Closing socket")
    tcp_socket.close()

Result: Communication between TCP/IP Client and Server has been established 
 successfully.