My game has an error

[pythonnoob83]

I am working on this Questor game.
I keep getting an error thats posted below.
I am using Python IDLE 2.6.5
Someone please help me fix this error and make the game work
I have spent too much time on it already.

Thanks

-----

Traceback (most recent call last):
File "G:\Class\Modul e 4\Module 4 SLP\slp project num3.py", line 5, in <module>
result = Qnode('Phython' );
NameError: name 'Qnode' is not defined

# define some constants for future use

kQuestion = 'question'
kGuess = 'guess'
result = Qnode('Phython');

def yesno(prompt):
    ans = raw_input(prompt)
    return (ans[0]=='y' or ans[0]=='Y')

class Qnode:
    newAnsNode='';
    newanswer = '';
    oldAnsNode = '';
    nodes = {}
    def __init__(self,guess):
        self.nodetype = kGuess
        self.desc = guess


    def query(self):
        if (self.nodetype == kQuestion):
            return self.desc + " "
        elif (self.nodetype == kGuess):
            return "Is it a " + self.desc + "? "
        else:
            return "Error: invalid node type!"


    def nextnode(self,answer):
        return self.nodes[answer]


    def makeQuest( self, question, newitem, newanswer ):


        newAnsNode = Qnode(newitem)
        newAnsNode.newanswer = newanswer;
        oldAnsNode = Qnode(self.desc)


        self.nodetype = kQuestion
        self.desc = question

        self.nodes = {newanswer:newAnsNode, not newanswer:oldAnsNode}

def traverse(fromNode):
    yes = yesno( fromNode.query() )

    if (fromNode.nodetype == kGuess):
        if (yes):
            print "I'm a genius!!!"
           
            return fromNode

    return traverse( fromNode.nextnode(yes) )

def run():
    topNode = Qnode('python')
    item = ''
    done = 0

    while not done:
        result = traverse( topNode )

    if (result):
        item = raw_input("OK, what were you thinking of? ")
        print "Enter a question that distinguishes a",
        print item, "from a", result.desc + ":"
q = raw_input()
item = q
ans = yesno("What is the answer for " + item + "? ")
result.makeQuest( q, item, ans )
print "Got it."

print
done = not yesno("Do another? ")
print

if __name__ == '__main__':
    run()
    print raw_input("press Return>")
else:
    print "Module questor imported."
print "To run, type: questor.run()"
print "To reload after changes to the source, type: reload(questor)"

[bvdet]

Your error is obvious. "Qnode" is not defined. What is "Qnode" anyway?

"Qnode" is a class object that is defined later. Make the statement using "Qnode" after the class definition.