Result of ``a is b''

[Axel Boldt]

David MacQuigg <dmq at gain.com> wrote 

> >>> x = 'akdijfkdienlskfi'
> >>> y = 'akdijfkdienlskfi'
> >>> x is y
>  True
> >>> x = 'a b'
> >>> y = 'a b'
> >>> x is y
>  False

Wow. So it seems that the action of "is" on immutables is unspecified
and implementation dependent, thus useless to the programmer.

Maybe one could redefine "is" on immutables as follows: for strings
and numbers it acts as "==", for tuples it acts as componentwise "is".
That would be a more useful operator IMHO.

Axel