Game won't Save

[pythonnoob83]

I got my game to work but I when I run it and answer the first question it says Could not save.
Why is my game not saving.
It does create the save game file but it is always empty.
Please Help!!!

# questor.py 

# define some constants for future use

kQuestion = 'question'
kGuess = 'guess'

# define a function for asking yes/no questions
def yesno(prompt):
    ans = raw_input(prompt)
    return (ans[0]=='y' or ans[0]=='Y')

# define a node in the question tree (either question or guess)
class Qnode:

# initialization method
    def __init__(self,guess):
        self.nodetype = kGuess
        self.desc = guess

# get the question to ask 
    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!"

# return new node, given a boolean response
    def nextnode(self,answer):
        return self.nodes[answer]

# turn a guess node into a question node and add new item
# give a question, the new item, and the answer for that item
    def makeQuest( self, question, newitem, newanswer ):

# create new nodes for the new answer and old answer
        newAnsNode = Qnode(newitem)
        oldAnsNode = Qnode(self.desc)

# turn this node into a question node
        self.nodetype = kQuestion
        self.desc = question

# assign the yes and no nodes appropriately
        self.nodes = {newanswer:newAnsNode, not newanswer:oldAnsNode}


def traverse(fromNode):
# ask the question
    yes = yesno( fromNode.query() )

# if this is a guess node, then did we get it right?
    if (fromNode.nodetype == kGuess):
        if (yes):
            print "I'm a genius!!!"
            return
# if we didn't get it right, return the node
        return fromNode

# if it's a question node, then ask another question
    return traverse( fromNode.nextnode(yes) )

def run():
# start with a single guess node
    try:
        f = file('questor.dat', 'r')
        topNode = pickle.load(f)
        f.close()
    except:
        topNode = Qnode('python')

    done = 0
    while not done:
         try:
            f = file('questor.dat', 'w')
            pickle.dump(topNode, f)
            f.close()
         except:
            print "Could not save!"
# ask questions till we get to the end
         result = traverse( topNode )

# if result is a node, we need to add a question
         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()
            ans = yesno("What is the answer for " + item + "? ")
            result.makeQuest( q, item, ans )
            print "Got it."

# repeat until done
            print
            done = not yesno("Do another? ")
            #print

# immediate-mode commands, for drag-and-drop or execfile() execution
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)"

# end of questor.py

[dwblas]

You can only pickle a class instance. Start herefor a class tutorial.

[sheldor]

Wrong

You can only pickle a class instance. Start herefor a class tutorial.

The pickle module implements a fundamental, but powerful algorithm for serializing and de-serializing a Python object structure.

http://docs.python.org/library/pickle.html

also I ran your code you need to import pickle or cpickle and it will work