python3: 'where' keyword

[Andrey Tatarinov]

Nick Coghlan wrote:
>> It also allows the necessary but uninteresting setup for an expression 
>> to be moved "out of the way", bringing the expression that does the 
>> real work to prominence.
> Killer app for this keyword:
> 
> class C(object):
> 
>   x = property(get, set) where:
>     def get(self):
>       return "Silly property"
>     def set(self, val):
>       self.x = "Told you it was silly"

oh, that's great! I can't imagine prettier example