[Python-Dev] What's the status of PEP 505: None-aware operators?
Michel Desmoulin
desmoulinmichel at gmail.com
Tue Dec 12 03:39:17 EST 2017
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
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