ABCs -> infix syntax for isinstance() ?

[Boris Borcic]

Bruno Desthuilliers wrote:
> bborcic at gmail.com a écrit :
...
>> A intriguing wider proposition would be to transpose Ruby's notion of
>> "Open Classes" to Python built-in metaclasses (or just to type
>> itself ?).
> 
> No, thanks. Even the Ruby guys start to think making evrything open may 
> not be such a good idea after all.

Wasn't an all-or-nothing proposition; a good objection is spelled out in PEP 
3119 (ABCs) :

<citing>

...but there are some good reasons to keep the built-in types immutable (for 
one, they are shared between all Python interpreters running in the same address 
space, as is used by mod_python)

</citing>

Cheers, BB