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

[Skip Montanaro]

    Geoff> What about ifelse(condition, then clause[, else clause])? 

In every discussion of a ternary operator this sort of suggestion comes up.
The problem with a new builtin is that all arguments must be evaluated
before the function is called.  This prevents the short-circuit behavior
that is so useful in many instances.

I've updated PEP 308 to reflect this.

Skip