python scope issue

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

Are you sure you're not modifying arcount anywhere else in the excluded code? Please post that code — inspectorG4dget
– inspectorG4dget, Commented Nov 22, 2012 at 23:22
You're modifying arcount, either directly or through a modification of header. — LSerni
– LSerni, Commented Nov 22, 2012 at 23:24

Ignacio Vazquez-Abrams · Accepted Answer · 2012-11-22 23:30:50Z

1

Because Python is strongly typed, and neither u'0' nor '0' are equal to 0.

answered Nov 22, 2012 at 23:30

Ignacio Vazquez-Abrams

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