python范围问题

Question

我遇到python变量范围问题。

def getIP(data,address):
    header = Header.fromData(data,0);
    arcount = header._arcount   //at this point arcount is some non-zero number

稍后在代码中（仍在方法getIP中）我想看看arcount是否为零：

...
    elif firstRR._type==RR.TYPE_NS:
    while(nscount!=0):
        print "arcount: ",arcount  //here it gives 0. why?
        if(arcount!=0):
            print "arcount isn't 0"
        else:
            print "can't reach header"

当我假设arcount不应为零时，打印“无法到达标题”。为什么它没有看到arcount？感谢

Answer 1

因为Python是强类型的，u'0'和'0'都不等于0。