s = socket.socket (socket_family, socket_type, protocol = 0)

#sever.py
import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
host = socket.gethostname()
port = 8088
s.bind((host,port))
try:
  while True:
    receive_data,addr = s.recvfrom(1024)
    print("來(lái)自服務(wù)器" + str(addr) + "的消息:")
    print(receive_data.decode('utf-8'))
    msg = input('please input send to msg:')
    s.sendto(msg.encode('utf-8'),addr)
except:
  s.close()

#client.py
import socket
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
try:
  while True:
    host = socket.gethostname()
    port = 8088
    send_data = input('please input msg:')
    s.sendto(send_data.encode('utf-8'),(host,port))
    msg,addr = s.recvfrom(1024)
    print("來(lái)自服務(wù)器" + str(addr) + "的消息:")
    print(msg.decode('utf-8'))
except:
  s.close()

#server.py
import socket
import logging

def main():
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # 創(chuàng)建socket對(duì)象

  addr = ('127.0.0.1', 9999)
  s.bind(addr) # 綁定地址和端口

  logging.info('UDP Server on %s:%s...', addr[0], addr[1])

  user = {} # 存放字典{addr:name}
  while True:
    try:
      data, addr = s.recvfrom(1024) # 等待接收客戶端消息存放在2個(gè)變量data和addr里
      if not addr in user: # 如果addr不在user字典里則執(zhí)行以下代碼
        for address in user: # 從user遍歷數(shù)據(jù)出來(lái)address
          s.sendto(data + ' 進(jìn)入聊天室...'.encode('utf-8'), address) # 發(fā)送user字典的data和address到客戶端
        user[addr] = data.decode('utf-8') # 接收的消息解碼成utf-8并存在字典user里,鍵名定義為addr
        continue # 如果addr在user字典里，跳過(guò)本次循環(huán)

      if 'EXIT'.lower() in data.decode('utf-8'):#如果EXIT在發(fā)送的data里
        name = user[addr]  #user字典addr鍵對(duì)應(yīng)的值賦值給變量name
        user.pop(addr)   #刪除user里的addr
        for address in user:  #從user取出address
          s.sendto((name + ' 離開(kāi)了聊天室...').encode(), address)   #發(fā)送name和address到客戶端
      else:  
        print('"%s" from %s:%s' %(data.decode('utf-8'), addr[0], addr[1])) 
        for address in user:  #從user遍歷出address
          if address != addr: #address不等于addr時(shí)間執(zhí)行下面的代碼
            s.sendto(data, address)   #發(fā)送data和address到客戶端

    except ConnectionResetError:
      logging.warning('Someone left unexcept.')

if __name__ == '__main__':
  main()

#clinet.py
import socket
import threading

def recv(sock, addr):
  '''
  一個(gè)UDP連接在接收消息前必須要讓系統(tǒng)知道所占端口
  也就是需要send一次，否則win下會(huì)報(bào)錯(cuò)
  '''
  sock.sendto(name.encode('utf-8'), addr)
  while True:
    data = sock.recv(1024)
    print(data.decode('utf-8'))


def send(sock, addr):
  '''
    發(fā)送數(shù)據(jù)的方法
    參數(shù)：
      sock：定義一個(gè)實(shí)例化socket對(duì)象
      server：傳遞的服務(wù)器IP和端口
  '''
  while True:
    string = input('')
    message = name + ' : ' + string
    data = message.encode('utf-8')
    sock.sendto(data, addr)
    if string.lower() == 'EXIT'.lower():
      break

def main():
  '''
    主函數(shù)執(zhí)行方法，通過(guò)多線程來(lái)實(shí)現(xiàn)多個(gè)客戶端之間的通信
  '''
  s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
  server = ('127.0.0.1', 9999)
  tr = threading.Thread(target=recv, args=(s, server), daemon=True)
  ts = threading.Thread(target=send, args=(s, server))
  tr.start()
  ts.start()
  ts.join()
  s.close()

if __name__ == '__main__':
  print("-----歡迎來(lái)到聊天室,退出聊天室請(qǐng)輸入'EXIT(不分大小寫(xiě))'-----")
  name = input('請(qǐng)輸入你的名稱:')
  print('-----------------%s------------------' % name)
  main()