kQuestion = \'question\' kGuess = \'guess\' # define a function for asking yes/n

Question

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
    topNode = Qnode('python')

done = 0
while not done:
# 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)"

Explanation / Answer

It's because the 'else' clause is empty. Just put a # before the else as well. Try this and see if it works

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