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[Python-Dev] Examples for PEP 572

David Mertz mertz at gnosis.cx
Wed Jul 4 12:31:11 EDT 2018 
On Wed, Jul 4, 2018 at 12:13 PM Steven D'Aprano <steve at pearwood.info> wrote:

> On Wed, Jul 04, 2018 at 10:20:35AM -0400, David Mertz wrote:
> > Hmmm... I admit I didn't expect quite this behavior. I'm don't actually
> > understand why it's doing what it does.
> >
> > >>> def myfun():
> > ...    print(globals().update({'foo', 43}), foo)
>
> Try it with a dict {'foo': 43} instead of a set :-)



> I think Chris meant to try it inside a function using locals() rather
> than globals.


Ah... you say "tomato" I say "raspberry"... set, dict...

Yeah, typo fixed, it makes more sense.  Still, even a `globals().update()`
expression is a binding operation.  But it works perfectly fine with
locals() also :-):

>>> def myfun():
...    print(locals().update({'foo': 44}), locals().get('foo'))
...
>>> myfun()
None 44

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