Yield after the return in Python function.

[Chris Angelico]

On Tue, Apr 6, 2021 at 12:40 PM Terry Reedy <tjreedy at udel.edu> wrote:
>
> On 4/5/2021 3:32 PM, Chris Angelico wrote:
>
> > On Tue, Apr 6, 2021 at 5:14 AM Terry Reedy <tjreedy at udel.edu> wrote:
> >> Python *could* do the same for expresssions: load 'a' (in this case)
> >> once into a register or stack slot and use that value consistently
> >> throughout the expression.  Replacing the eval with the following exec
> >> has the same effect.
> >
> > True, but I think that this would be enough of a semantic change that
> > Python should be very VERY careful about doing it.
>
> I consider it beyond a possibility.
>

I just realised that the whole eval/exec/namespace stuff is massive
overkill. All you need is an object that is inconsistent in its
boolification...

>>> class Wat:
...     def __bool__(self):
...             self.state = not getattr(self, "state", False)
...             return self.state
...
>>> a = Wat()
>>> a and not a
True

ChrisA