python3: 'where' keyword

[Andrey Tatarinov]

Paul Rubin wrote:
>>What would be the advantage of that over this?
>>
>>. x = sqrt(a) + sqrt(b) where:
>>.     a = 2.0
>>.     b = 3.0
> The idea of "where" is to allow re-using variable names instead of
> having to keep track of which ones are in use.  I just tried to give a
> very simple example of how you might do that more than once in a
> statement.

then I'd write something like this:

x = a + b where:
     a = sqrt(n) where:
         n = 2.
     b = sqrt(n) where:
         n = 3.