atm-class

atm-class.py

class ATM(object):

    @classmethod
    def _authenticate(cls, pin):
        # perform PIN verification and authentication
        return True

    @classmethod
    def withdraw_money(cls, pin, amount):
        if not cls._authenticate(pin):
            raise InvalidPin('Wrong PIN')

        cls.process_request(pin, amout)

    @classmethod
    def process_request(self, amount):
        # perform proess to withdraw money
        pass

# Method invocation to withdraw money
ATM.withdraw_money('1234', 20000)