socket实现UDP通信（python）

UDP客户端

from socket import *

# 指定服务器IP及端口号
server_name = '127.0.0.1'
server_port = 12000

# 建立UDP客户端, AF_INET表示底层网络使用IPv4，SOCK_DGRAM表示使用UDP协议
client_socket = socket(AF_INET, SOCK_DGRAM)
message = input('Input lowercase sentense:')
while message != 'end':
    # 将文本转为字节串，发送给服务器
    client_socket.sendto(message.encode(), (server_name, server_port))
    # 接受服务器返回的信息
    modified_message, server_address = client_socket.recvfrom(2048)
    # 将返回报文从字节转为字符串
    print(server_address, ' say: ', modified_message.decode())
    message = input('Input lowercase sentense:')
client_socket.close()

UDP 服务端

from socket import *
# 指定UDP服务器开放的端口
server_port = 12000
# 使用IPv4及UDP
server_socket = socket(AF_INET, SOCK_DGRAM)
# 绑定端口号
server_socket.bind(('127.0.0.1', server_port))
print('The server is ready to receive')

while(True):
    # 接收客户端发送的报文
    message, client_address = server_socket.recvfrom(2048)
    # 报文由字节转为字符串并转大写
    modified_message = message.decode().upper()
    # 将修改的信息转为字节，发送给客户端
    server_socket.sendto(modified_message.encode(), client_address)