[Python-Dev] What's the status of PEP 505: None-aware operators?

[Guido van Rossum]

And I'll never approve syntax to make it easier to just ignore all
exceptions without looking at them.

On Tue, Dec 12, 2017 at 12:48 AM, Chris Angelico <rosuav at gmail.com> wrote:

> On Tue, Dec 12, 2017 at 7:39 PM, Michel Desmoulin
> <desmoulinmichel at gmail.com> wrote:
> >
> >
> > Le 29/11/2017 à 19:02, Barry Warsaw a écrit :
> >> On Nov 29, 2017, at 12:40, David Mertz <mertz at gnosis.cx> wrote:
> >>
> >>> I think some syntax could be possible to only "catch" some exceptions
> and let others propagate.  Maybe:
> >>>
> >>>    val = name.strip()[4:].upper() except (AttributeError, KeyError): -1
> >>>
> >>> I don't really like throwing a colon in an expression though.  Perhaps
> some other word or symbol could work instead.  How does this read:
> >>>
> >>>    val = name.strip()[4:].upper() except -1 in (AttributeError,
> KeyError)
> >>
> >> I don’t know whether I like any of this <wink> but I think a more
> natural spelling would be:
> >>
> >>    val = name.strip()[4:].upper() except (AttributeError, KeyError) as
> -1
> >>
> >> which could devolve into:
> >>
> >>    val = name.strip()[4:].upper() except KeyError as -1
> >>
> >> or:
> >>
> >>    val = name.strip()[4:].upper() except KeyError # Implicit `as None`
> >>
> >> I would *not* add any spelling for an explicit bare-except equivalent.
> You would have to write:
> >>
> >>    val = name.strip()[4:].upper() except Exception as -1
> >>
> >> Cheers,
> >> -Barry
> >>
> >
> > I really like this one. It's way more general. I can see a use for
> > IndexError as well (lists don't have the dict.get() method).
> >
> > Also I would prefer not to use "as" this way. In the context of an
> > exception, "as" already binds the exception to a variable so it's
> confusing.
> >
> > What about:
> >
> >
> > val = name.strip()[4:].upper() except Exception: -1
>
> That happens to be the exact syntax recommended by PEP 463 (modulo
> some distinguishing parentheses).
>
> https://www.python.org/dev/peps/pep-0463/
>
> ChrisA
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-- 
--Guido van Rossum (python.org/~guido)
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