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

[Erik Max Francis]

Samuele Pedroni wrote:

> statements are not expressions.

Y'know, colons already can appear in expressions.  Ever heard of
lambdas?

> For example the : in else: is absolutely spurious for the expression
> case.

It's not for the `if C:' portion, the alternative of which is to add an
extra keyword (like `then'), which already has huge inertia pushing
against it.

	if C: x else: y

reads left-to-right, requires no new keywords or punctuation, is
unambiguous, and is totally analogous to the if...else statement and
thus is crystal clear.

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