клиенскый код часть написан на python2.7

#-*-coding:utf8;-*-
from socket import *

HOST=''
PORT = 9091
ADDR = (HOST, PORT)

tcpCliSock = socket (AF_INET, SOCK_STREAM)
print("[Режим ожидание....]")
while True:
     try:
        tcpCliSock.connect(ADDR)
    except Exception:
          continue
    print(tcpCliSock.recv(1024))
    print("\n")

    while True:
         inp = raw_input ('==>')
         if str(0)<inp:
            if not inp:
               break
            tcpCliSock.send(inp)
           print(tcpCliSock.recv(1024))

tcpCliSock.close()

Сераерный код на python3
#-*-coding:utf8;-*-

from socket import *
import subprocess
import time
import sys, os

def times():
   tim=time.ctime()
   return tim

host = ""
port = 9091
ADDR=(host, port)

tcp=socket(AF_INET, SOCK_STREAM)
tcp.bind(ADDR)
tcp.listen(1)
print("start server. host")
print("-"*31)

while True:
     tcpCli, addr=tcp.accept()
     print("client connected with address\n", addr)
     tcpCli.send("[+] Сервер Готов". encode('utf-8'))
     while True:
         data=tcpCli.recv(1024)
         print(data)
         if data.decode('utf-8')=="time":
            response = '[+]' % times()
            tcpCli.send(response.encode('utf-8'))
        else:
           tcpCli.send(data.encode('utf-8'))
           break

       tcpCli.close()
tcp.close()