On Wed, Jul 25, 2018 at 9:20 PM Chris Angelico <ros...@gmail.com> wrote:
> On Thu, Jul 26, 2018 at 11:02 AM, David Mertz <me...@gnosis.cx> wrote:
> > That is disingenuous, I think. Can this raise an AttributeError?
> >
> > spam?.eggs?.bacon
> >
> > Of course it can! And this is exactly the pattern used in many examples
> in
> > the PEP and the discussion. So the PEP would create a situation where
> code
> > will raise AttributeError in a slightly—and subtly—different set of
> > circumstances than plain attribute access will.
>
> I don't understand. If it were to raise AttributeError, it would be
> because spam (or spam.eggs) isn't None, but doesn't have an attribute
> eggs (or bacon). Exactly the same as regular attribute access. How is
> it slightly different? Have I missed something?
>
That was my reaction, too.
food = spam?.eggs?.bacon
Can be rewritten as:
food = spam
if spam is not None and spam.eggs is not None:
food = spam.eggs.bacon
They both behave identically, no? Maybe I missed the point David was trying
to make.
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