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

[Roman Suzi]

On 8 Feb 2003, Paul Rubin wrote:

>How about further abuse of colon:
>
>   f(:expression)
>
>is short for f(lambda: expression)
>
>So we'd implement a conditional expression with
>
>   def cond(condition, v1, v2):
>      if condition:
>         return v1()
>      else:
>        return v2()
>
>To call it, we'd say, for example,
>
>   print cond(x >= 0, :sqrt(x), :"imaginary roots")

Better to make ! equal to lambda ;-)

print cond(x >= 0, !:sqrt(x), !:"imaginary roots")

>I don't see immediately whether this makes any syntax ambiguities with
>existing statements, since I can't think of anyplace where colon can
>currently appear where an expression can also appear.
>

Sincerely yours, Roman Suzi
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