python - TypeError: unorderable types: atm() >= int() -

i have 3 classes, atm (main class), atmfees (subclass of atm) , transaction. want have class atmfees inherit methods parent class atm.

the atmfees class takes atm object parameter, initializing atm.__init__(self, balance)

i want override parent/super class's "withdrawal" method, modifying 1 of parameters -- subtracting 50 cents amount -- , accessing super method in atm new amount.

doing returns typeerror: unorderable types: atm() >= int()

i have absolutely no idea here, i've changed can't seem work.

import transaction import random  class atm(object):      def __init__(self, bal):         self.__balance = bal         self.transactionlist = []      def deposit(self, name, amount):         self.__balance += amount         ndt = transaction.transaction(name, amount)         self.transactionlist.append(ndt)      def withdraw(self, name, amount):         if self.__balance >= amount:             self.__balance -= amount             nwt = transaction.transaction(name, amount)             self.transactionlist.append(nwt)         else:             print('uh oh, not enough money!')      def get_balance(self):         return self.__balance      def __str__(self):         string_return = ""          transaction in self.transactionlist:             string_return += str(transaction) + "\n"         string_return = '\n' + 'the balance $' + format(self.__balance, ',.2f')         return string_return  class atmfee(atm):      def __init__(self, balance):         atm.__init__(self, balance)      def widthrawal(cls, name, amount):         amount = amount - .50         atm.widthrawal(cls, name, amount)      def deposit():         pass  def main():      myatm = atm.atm(75)     fees  = atm.atmfee(myatm)      fees.withdraw("2250",30)     fees.withdraw("1000",20)     myatm.deposit("3035",10)      print("let's withdraw $40")     if myatm.withdraw("amazon prime",40) == 0:         print ("oh noes! no more money!")      print()     print("audit trail:")     print(myatm)  main(); 

the full code posted here: https://gist.github.com/markbratanov/e2bd662d7ff83ca5ef61

any guidance / appreciated.

the error message means says - can't order object , integer. possible (for reason) in python 2, ordering arbitrary (for example, empty dict {} greater integer, no matter how large...), not in python 3, because comparison meaningless.