[Tutor] Class instance understanding = None

[David]

David wrote:

> but when I change it to;
> start_total()
> start = start_total()
> a = Account(start)
> 
> here is the error;
> Enter Amount: 100
> Traceback (most recent call last):
>   File "./py_pettycash.py", line 77, in <module>
>     menu()
>   File "./py_pettycash.py", line 53, in menu
>     a.deposit(cash)
>   File "./py_pettycash.py", line 15, in deposit
>     self.balance = self.balance + amt
> TypeError: unsupported operand type(s) for +: 'NoneType' and 'Decimal'
> 
> -david
> 
> 
Ok I got it, same problem I had before no return :)

def start_total():
     fname = open("cash.dat", "r")
     contents = cPickle.Unpickler(fname)
     data = contents.load()
     print "The current balance is", data
     fname.close()
     return data

start = start_total()
a = Account(start)

Thanks all, any other comments?, I am going to add some error checking 
but, I am so happy, woopee

-david

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