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