udp的sever不需要監聽也不需要建立連線

啟動後只能被動等待客戶端發訊息過來

客戶端傳送訊息的同時還自帶地址資訊

回覆訊息的時候不僅需要傳送訊息，還要把對方的地址填上

SEVER:

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)  #datagram
sk.bind(('127.0.0.1',8080))
while 1:
    msg,addr = sk.recvfrom(1024)
    print(addr)
    print(msg.decode('utf-8'))
    info = input('>>>').encode('utf-8')
    sk.sendto(info,addr)

sk.close()

CLIENT1:

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)

ip_port = ('127.0.0.1',8080)    #ip和埠號的元組
while 1:
    info = input('二哥：')
    info = ('\33[32m來自二哥的訊息：%s\33[0m'%info).encode('utf-8')
    sk.sendto(info,ip_port)
    ret,addr = sk.recvfrom(1024)
    print(ret.decode('utf-8'))

sk.close()

CLIENT2:

import socket
sk = socket.socket(type=socket.SOCK_DGRAM)

ip_port = ('127.0.0.1',8080)    #ip和埠號的元組
while 1:
    info = input('泰哥：')
    info = ('\33[34m來自泰哥的訊息：%s\33[0m' % info).encode('utf-8')
    sk.sendto(info,ip_port)
    ret,addr = sk.recvfrom(1024)
    print(ret.decode('utf-8'))

sk.close()