when i try to run this python script.

def handler(session, args):
        while (session.ready() == True):
                session.answer()
                number=session.getVariable("caller_id_number")
                consoleLog("info",number)
                session.setVariable("varnum", "hammer");
                consoleLog("info",varnum)

i encounter with this message and call is hangup.

"Message: global name 'varnum' is not defined
Exception: None"

Any help in this regard would be much appreciated.

Thanks.