server

from socket import *

myHost = ''
myPort = 50007

sockobj = socket(AF_INET, SOCK_STREAM)
sockobj.bind((myHost, myPort))
sockobj.listen(5)

while True:
    connection, address = sockobj.accept()
    print('Server connected by', address)
    while True:
        data = connection.recv(1024)
        if not data: break
        connection.send(b'Echo=>' + data)
    connection.close()

client

import sys
from socket import *

serverHost = 'localhost'
serverPort = 50007

message = [b'Hello network world']

if len(sys.argv) > 1:
    serverHost = sys.argv[1]
    if len(sys.argv) > 2:
        message = (x.encode() for x in sys.argv[2:])

sockobj = socket(AF_INET, SOCK_STREAM)
sockobj.connect((serverHost, serverPort))

for line in message:
    sockobj.send(line)
    data = sockobj.recv(1024)
    print('Client received:', data)

sockobj.close()