服务端要做的事情是：
1. 创建一个Socket对象
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--> import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 2. 绑定一个端口
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--> s.bind(( "" , 8081 )) 3. 接受来自客户端的消息
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--> while True:
# Receive up to 1,024 bytes in a datagram
data, addr = s.recvfrom( 1024 )
print " Received: " , data, " from " , addr 二、客户端(Client.py)
客户端要做的事情是：
1. 创建一个Socket对象。
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--> import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 2. 向某个服务器的指定的端口发送消息。由于使用UDP，如果服务器端未接收到将会丢弃数据包。
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--> port = 8081
host = " localhost "
while True:
msg = raw_input()
s.sendto(msg, (host, port)) 三、运行试试
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