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From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: Need help with this asap.
Date: Tue, 12 Jan 2016 13:12:43 +0100
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ifeanyioprah--- via Python-list wrote:

> Create a class called BankAccount
> Create a constructor that takes in an integer and assigns this to a 
`balance` property.
> Create a method called `deposit` that takes in cash deposit amount and 
updates the balance accordingly.
> Create a method called `withdraw` that takes in cash withdrawal amount and 
updates the balance accordingly. if amount is greater than balance return 
`"invalid transaction"`

Return or print? You print.

> Create a subclass MinimumBalanceAccount of the BankAccount class.

I would suppose that such a MinimumBalanceAccount needs a way to specify the 
minimum balance (in the initializer) and to ensure (both initially and in 
the withdraw() method) that the account actually has that minimum balance.

> This was my solution and I still got error. What should I do.
> class BankAccount: 
>     def __init__(self, initial_amount): 
>         self.balance = initial_amount 
>     def deposit(self, amount): 
>         self.balance += amount 
>     def withdraw(self, amount): 
>         if self.balance>= amount: 
>             self.balance  -=  amount 
>         else: 
>           print('invalid transaction') 
> a1 = BankAccount (90) 
> a1.deposit(90) 
> a1.withdraw(40) 
> a1.withdraw(1000) 
> class MinimumBalanceAccount(BankAccount): 
>     def __init__(self): 
>         BankAccount.__init__(self) 
>