python2.7和python3.4网络编程处理二进制数据区别

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python 2.7中客户端向服务器发送数据demo
    ser = socket.socket()
        ser.connect((ghost,gport))
        lenstr = len(str)
        lendata = struct.pack('BB',lenstr/256,lenstr%256)
        ser.send(lendata)
        ser.send(str)
        recvlen = ser.recv(2)
        recvlen = struct.unpack('BB',recvlen)
        totallen = recvlen[0]*256 + recvlen[1]%256
        str = ser.recv(totallen)
        ser.close()

python 3.4中客户端向服务器发送数据demo
        lenstr = '%s%s' % (lenstr,len(str))
        str = "188888888222050%4s%s" % (lenstr,str)
        if termtype == 1:
            writeloginfo(6,'[request]::'+str)
        elif termtype == 2:
             writeloginfo(5,'[request]::'+str)
        lenstr = len(str)
        lendata = struct.pack('!BB',0,lenstr)
        ser.send(lendata)
        ser.send(str.encode())
        recvlen = ser.recv(2)
        recvlen = struct.unpack('!BB',recvlen)
        totallen = recvlen[0]*256 + recvlen[1]%256
        str = ser.recv(totallen)
        str = repr(str)

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