Sequence-length - Missing the obvious ?

[Michael Husmann]

python knows that you have passed a string. The same would
work with lists, tuples ... but not if you pass an integer.

HTH,
Michael

> considering the following code:
> 
> -----------------------------------
> 
> class sequence:
> 
>         def __getitem__( self, i ):
>                 return self.d[i]
> 
> seq = sequence()
> seq.d = "Hallo"
> 
> for item in seq:
>         print item,
> 
> -----------------------------------
> 
> This works - gives out "H a l l o".
> __getitem__ get´s called five times.
> 
> But why ? How does the for loop knows
> how much elements the sequence contains ?
> I did not program the __len__ function,
> so... how ?
> 
> --
> --
>     Regards & Gruesse from Mickey @ http://www.Vanille.de
>   ---------------------------------------------------------
>   How could anyone know me - when I don't even know myself ?