python3: 'where' keyword

[Andrey Tatarinov]

Nick Coghlan wrote:
>> And about examples for usage "where" keyword
>>
>> reading http://manatee.mojam.com/~skip/python/fastpython.html I 
>> understand that almost every example should use that keyword =)
> I suspect polluting the outer namespace would still be faster, since 
> Python wouldn't have to create the extra level of scoping all the time.

sure, but just a little bit slower =)