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Catch and name an exception in Python 2.5 +

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  Catch and name an exception in Python 2.5 + Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-27 05:56 +1000
    Re: Catch and name an exception in Python 2.5 + Thomas Jollans <t@jollybox.de> - 2011-08-26 22:36 +0200
      Re: Catch and name an exception in Python 2.5 + Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-27 13:45 +1000
        Re: Catch and name an exception in Python 2.5 + Thomas Jollans <t@jollybox.de> - 2011-08-27 11:57 +0200

#12240 — Catch and name an exception in Python 2.5 +

In Python 3, you can catch an exception and bind it to a name with:

try:
    ...
except ValueError, KeyError as error:
    pass

In Python 2.5, that is written:

try:
    ...
except (ValueError, KeyError), error:
    pass

and the "as error" form gives a SyntaxError.

Python 2.6 and 2.7 accept either form.

Is there any way to catch an exception and bind it to a name which will work
across all Python versions from 2.5 onwards?

I'm pretty sure there isn't, but I thought I'd ask just in case.


-- 
Steven

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#12241

On 26/08/11 21:56, Steven D'Aprano wrote:
> In Python 3, you can catch an exception and bind it to a name with:
> 
> try:
>     ...
> except ValueError, KeyError as error:
>     pass
> 
> In Python 2.5, that is written:
> 
> try:
>     ...
> except (ValueError, KeyError), error:
>     pass
> 
> and the "as error" form gives a SyntaxError.
> 
> Python 2.6 and 2.7 accept either form.
> 
> Is there any way to catch an exception and bind it to a name which will work
> across all Python versions from 2.5 onwards?
> 
> I'm pretty sure there isn't, but I thought I'd ask just in case.

It's not elegant, and I haven't actually tested this, but this should work:

try:
    ...
except (ValueError, KeyError):
    error = sys.exc_info()[2]

-- 
Thomas

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#12248

Thomas Jollans wrote:

> On 26/08/11 21:56, Steven D'Aprano wrote:

>> Is there any way to catch an exception and bind it to a name which will
>> work across all Python versions from 2.5 onwards?
>> 
>> I'm pretty sure there isn't, but I thought I'd ask just in case.
> 
> It's not elegant, and I haven't actually tested this, but this should
> work:
> 
> try:
>     ...
> except (ValueError, KeyError):
>     error = sys.exc_info()[2]

Great! Thanks for that, except I think you want to use [1], not [2].



-- 
Steven

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#12257

On 27/08/11 05:45, Steven D'Aprano wrote:
> Thomas Jollans wrote:
> 
>> On 26/08/11 21:56, Steven D'Aprano wrote:
> 
>>> Is there any way to catch an exception and bind it to a name which will
>>> work across all Python versions from 2.5 onwards?
>>>
>>> I'm pretty sure there isn't, but I thought I'd ask just in case.
>>
>> It's not elegant, and I haven't actually tested this, but this should
>> work:
>>
>> try:
>>     ...
>> except (ValueError, KeyError):
>>     error = sys.exc_info()[2]
> 
> Great! Thanks for that, except I think you want to use [1], not [2].

Ah, yes. Of course.

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