python3学习问题汇总

1、python2脚本转python3报类型错误

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.

 def Deal(sock, user):
     while True:
         data = sock.recv(BUFSIZ).decode() #接收用户的数据

         # print(data)
         print(re.match('[to:.+]', data))
         if data == 'quit': #用户退出
             del clients[user]
             sock.send(data).encode().decode()
             sock.close()
             print('%s logout' %user)
             break
         elif re.match('to:.+', data) is not None: #选择通信对象
             data = data[3:]
             print(data)
             if data in clients:
                 chatwith[sock] = clients[data]
                 chatwith[clients[data]] = sock
             else:
                 sock.send('the user %s is not exist' %data.encode())
         else:
             if sock in chatwith: #进行通信
                 chatwith[sock].send(("[%s] %s: %s" %(ctime(), user, data)).encode())
             else:
                 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

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