Python Programming - Classes - Discussion

class BankAccount:
    def __init__(self, balance):
        self.balance = balance

    def withdraw(self, amount):
        self.balance -= amount

class SavingsAccount(BankAccount):
    def __init__(self, balance, interest_rate):
        super().__init__(balance)
        self.interest_rate = interest_rate

    def add_interest(self):
        self.balance += self.balance * self.interest_rate