输入16进制显示为16进制

while 1: 
    try:        
        num = raw_input("Enter Num: ") 
        addnum = '0x'+num
        print addnum
        a= int(addnum,16)
        lad = a-128
        print a, lad, hex(a)
    except:
        pass 

 显示效果如下：