TypeError: ‘str’ does not support the buffer interface

原因：Python3x的string类型与Python2x的类型不相同，在Python3x中需要将str编码，如：

套接字的成员函数send

socket.send(bytes[, flags]) 形参为字节类型

socket.recv(bufsize[, flags]) Receive datafrom the socket. The return value is abytes object representing the data received.

 1 def Deal(sock, user):
 2     while True:
 3         data = sock.recv(BUFSIZ).decode() #接收用户的数据
 4 
 5         # print(data)
 6         print(re.match('[to:.+]', data))
 7         if data == 'quit': #用户退出
 8             del clients[user]
 9             sock.send(data).encode().decode()
10             sock.close()
11             print('%s logout' %user)
12             break
13         elif re.match('to:.+', data) is not None: #选择通信对象
14             data = data[3:]
15             print(data)
16             if data in clients:
17                 chatwith[sock] = clients[data]
18                 chatwith[clients[data]] = sock
19             else:
20                 sock.send('the user %s is not exist' %data.encode())
21         else:
22             if sock in chatwith: #进行通信
23                 chatwith[sock].send(("[%s] %s: %s" %(ctime(), user, data)).encode())
24             else:
25                 sock.send('Please input the user who you want to chat with'.encode())

2、python3中使用has_key报错

原因：python3中已经不包含此项

解决方法：

用 k in dict 的方式代替

 1 while True:
 2     print('waiting for connection...')
 3     tcpCliSock, addr = tcpSerSock.accept()
 4     print(tcpCliSock,addr)
 5     print('...connected from:',addr)
 6     username = tcpCliSock.recv(BUFSIZ).decode() #接收用户名
 7     print('The username is:',username)
 8     if username in clients: #查找用户名
 9         tcpCliSock.send("Reuse").encode() #用户名已存在
10         tcpCliSock.close()
11     else:
12         tcpCliSock.send("Welcome!".encode()) #登入成功
13         clients[username] = tcpCliSock
14         chat = threading.Thread(target = Deal, args = (tcpCliSock,username)) #创建新线程进行处理
15         chat.start() #启动线程