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

[Barry Warsaw]

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

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