client端：

import socket
client = socket.socket()
client.connect(('localhost',8888))
while True:
    msg=input(">>:").strip()
    if len(msg) == 0 : continue
    client.send(msg.encode('utf-8'))
    data = client.recv(10240)
    print("recv:",data.decode())
client.close()
#################    
server端支持多线程完整示例代码：
import socketserver
class MyTCPHandler(socketserver.BaseRequestHandler):
    def handle(self):
        while True:
            try:
                self.data = self.request.recv(1024).strip()
                print("{} wrote:".format(self.client_address[0]))
                print(self.data)
                self.request.send(self.data.upper())
            except ConnectionResetError as e:
                print("err",e)
                break
if __name__ == "__main__":
    HOST,PORT="0.0.0.0",8888
    server= socketserver.ThreadingTCPServer((HOST,PORT),MyTCPHandler)
    server.serve_forever()

#################    

server端支持多连接,将socketserver.TCPServer改为socketserver.ThreadingTCPServer