python作用域问题

Question

I'm having problems with python variable scopes.

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

later in the code (still inside the method getIP) I want to see if arcount is zero or not:

...
    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"

And this prints "can't reach header", when I was assuming arcount shouldn't be zero. Why it doesn't see arcount? Thanks

Answer 1

因为Python是强类型的，所以u'0'和'0'都不等于0 。