PEP 308 - ternary operator

[Erik Max Francis]

Nick Trout wrote:

> I think the definition of short circuiting is a little blurred. I
> think it
> basically means you dont want to evaluate the to values before you
> return
> one of them, which I don't believe I'm doing in either case.

When you explicitly have to defer execution, like you did in the second
case, that doesn't qualify as short circuiting.  In short circuiting the
evaluation is implicit.

	result = {True: math.sqrt(x), False: 0}[x >= 0]

Even when you defer it with an explicit function call, the _value_ is
still executed, it's just that the value is now a function.

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