On Sun, Oct 24, 2021 at 05:40:55PM +0100, Jonathan Fine wrote:
> Please forgive me if it's not already been considered. Is the following
> valid syntax, and if so what's the semantics? Here it is:
>
> def puzzle(*, a=>b+1, b=>a+1):
> return a, b
We can consider that to be syntactic sugar for:
def puzzle(*, a=None, b=None):
if a is None:
a = b+1
if b is None:
b = a+1
So that has a perfectly sensible interpretation:
- a is optional
- b is optional
- but you must supply at least one.
and should be perfectly legal. I see no reason to prohibit it.
(It would be nice if we could give a better exception, rather than just
UnboundLocalError, but that's not essential.)
--
Steve
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