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

[Andrew Dalke]

Andrew Koenig
> holger> Maybe Roman Suzi (IIRC) has found one (short-circuiting)
>
> holger>     cond -> (true_expr, false_expr)
>
> holger> which i am currently thinking about.
>
> I'm not thrilled about this example because if you cover up the
> "cond ->" part, you get what looks like a tuple, and tuples don't
> short-circuit.

Still against the idea, but what about

  cond -> true_expr else false_expr

?  Reads in the right order, the -> can be recognized by the
parser, "else" already exists, and you can figure the context
given any two terms, that is,
   cond ->
   -> true_expr
   true_expr else
   else false_expr

are all obviously part of an if/else expression and nothing else.

                    Andrew
                    dalke at dalkescientific.com