dero | Python Fiddle

class BankAccount:
    def withdraw():
        pass
    def deposit():
        pass
class SavingsAccount(BankAccount):
    balance = None
    def __init__(self):
        self.balance = 500
     def deposit(deposit):
            if deposit < 0:
                return "Invalid deposit amount"
            else:
                self.balance += deposit
     def withdraw(withdrawal):
                    if self.balance - withdrawal < 500:
                        print 'Cannot withdraw beyond the minimum account balance'
                    elif:
                        withdrawal > self.balance
                        print("Cannot withdraw beyond the minimum account balance")
                    elif:
                        withdrawal < 0
                        return "Invalid withdraw amount"
class CurrentAccount(BankAccount):
    balance = None
    def __init__(self):
        self.balance = 0
    def deposit(depositamounts):
        if depositamounts < 0:
            return "Invalid deposit amount"
        self.balance += depositamounts
        return self.balance
    def withdraw(cashwithdraw):
        if cashwithdraw < 0:
            return Invalid withdraw amount
        elif:
            cashwithdraw > self.balance
            return Cannot withdraw beyond the current account balance
        else:
            self.balance -= cashwithdraw
            return self.balance

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