[Tutor] account class

[Remco Gerlich]

On Sat, Jul 22, 2000 at 07:42:25PM -0400, Steven Gilmore wrote:
> I'm trying to write a class that models a bank account. I've started simple
> with a deposit method, a print statement method, and balance property (I
> haven't gotten to the interest yet).  Maybe I'm missing something though I
> can't figure out what.  Since you guys/gals have been helpful so far maybe
> somebody could shed so light.
> 
> Tell me it I have got this right
> (exaggerated comments)
> 
> class Account:
> #when a new instance of this class is created,  this line is called #
>      def __init__(self):
>            self.balance =  0.0
>  #this sets the balance property to the value of the argument#
>      def deposit(self,balance):
>           self.balance= balance
>   #prints a statement #
>      def  statement():
>           print balance
> 
> >>> import account
> >>> a = account.Account()
> >>> a.deposit(1.0)
> >>> a.statement()
> Traceback (innermost last):
>   File "<interactive input>", line 0, in ?
> TypeError: no arguments expected
> 
> hope that's enough info for ya to help me     :)

Just change that into 
    def statement(self):
        print self.balance
		
Every method *must* have the instance as its first arguments, since
the construct "instance.method()" (like "a.statement()") silently
sends that argument. You'll get used to it :-)

-- 
Remco Gerlich,  scarblac@pino.selwerd.nl