For review: PEP 308 - If-then-else expression

[A. Lloyd Flanagan]

> Half baked idea warning - what about:
> 
>     Boolean:
> 
>         c -> { True: x, False: y }
> 
>     Int:
> 
>         c -> { 0: x, 1: y, 2: z }

If you use the same notation as for creating a dictionary, it will be
unobvious (to put it mildly) that options not selected are never
evaluated.  Just looking at this, I would expect it to behave like:
{ True: x, False: y }[c]