from socket import *

# 创建UDP套接字
serverSocket = socket(AF_INET, SOCK_DGRAM)
# 绑定本机IP地址和端口号
serverSocket.bind(('', 12000))

########## Begin ##########
# 接收客户端消息
message, address = serverSocket.recvfrom(1024)
# 将数据包消息转换为大写
message = message.upper()
#将消息传回给客户端
serverSocket.sendto(message,address)
########## End ##########