On 2013-06-21 01:08, Steven D'Aprano wrote:
> Here's my syntax plucked out of thin air:
>
> def func(arg, x=expression, !y=expression):
> ...
>
> where y=expression is late-bound, and the above is compiled to:
>
> def func(arg, x=expression, y=None):
> if y is None:
> y = expression
> ...
I think it would have to translate to something like
_temp_semaphore = object()
def func(arg, x=expression, y=_temp_semaphore):
if y is _temp_semaphore:
y = expression
...
because there are times you want to be able to pass None as a legit
value in such a case (speaking from the trenches after getting stung
by exactly that case on multiple occasions).
-tkc
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