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)
...
>>> myfun()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in myfun
TypeError: cannot convert dictionary update sequence element #0 to a
sequence
That said, this is a silly game either way. And even though you CAN
(sometimes) bind in an expression pre-572, that's one of those perverse
corners that one shouldn't actually use.
On Wed, Jul 4, 2018 at 9:58 AM Chris Angelico <ros...@gmail.com> wrote:
> On Wed, Jul 4, 2018 at 11:52 PM, David Mertz <me...@gnosis.cx> wrote:
> > On Wed, Jul 4, 2018 at 3:02 AM Chris Angelico <ros...@gmail.com> wrote:
> >>
> >> "Assignment is a statement" -- that's exactly the point under
> discussion.
> >> "del is a statement" -- yes, granted
> >> "function and class declarations are statements" -- class, yes, but
> >> you have "def" and "lambda" as statement and expression equivalents.
> >> "import is a statement" -- but importlib.import_module exists for a
> reason
> >>
> >> I'm going to assume that your term "mutating" there was simply a
> >> miswording, and that you're actually talking about *name binding*,
> >> which hitherto occurs only in statements. Yes, this is true.
> >
> >
> > Nope, not actually:
> >
> >>>> del foo
> >>>> print(globals().update({'foo':42}), foo)
> > None 42
> >
>
> Try it inside a function though.
>
> ChrisA
> _______________________________________________
> Python-Dev mailing list
> Python-Dev@python.org
> https://mail.python.org/mailman/listinfo/python-dev
> Unsubscribe:
> https://mail.python.org/mailman/options/python-dev/mertz%40gnosis.cx
>
--
Keeping medicines from the bloodstreams of the sick; food
from the bellies of the hungry; books from the hands of the
uneducated; technology from the underdeveloped; and putting
advocates of freedom in prisons. Intellectual property is
to the 21st century what the slave trade was to the 16th.
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
https://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
