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Nick Coghlan
*nix forums Guru Wannabe
Joined: 20 Feb 2005
Posts: 131
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 Posted: Thu Feb 03, 2005 10:17 am Post subject:
Re: new style exception handleing
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Ola Natvig wrote:
| Quote: | Peter Hansen wrote:
I can't actually think of a reason to need to base an
exception on a new-style class, but perhaps you have a
good one...
It's quite simple to bypass the problem, it was more the reason I was
wondering about too.
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Basically because fixing it without killing backward compatibility with string
exceptions is hard :)
Doesn't mean people aren't trying though (Google the python-dev archives, as
well as the python-list ones).
Cheers,
Nick.
--
Nick Coghlan | ncoghlan@email.com | Brisbane, Australia
---------------------------------------------------------------
http://boredomandlaziness.skystorm.net |
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Michele Simionato
*nix forums Guru Wannabe
Joined: 20 Feb 2005
Posts: 253
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| Posted: Thu Feb 03, 2005 7:48 am Post subject:
Re: new style exception handleing
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Google is your friend.
This has been discussed a lot in the past. For instance, google for the
thread,
"Exceptions as New Style Classes", there was also a PEP by Steven
Taschuk,
IIRC.
Michele Simionato |
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Ola Natvig
*nix forums beginner
Joined: 02 Mar 2005
Posts: 18
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| Posted: Thu Feb 03, 2005 7:33 am Post subject:
Re: new style exception handleing
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Peter Hansen wrote:
| Quote: | Ola Natvig wrote:
Does anybody know why it's not possible to raise Exceptions which are
types (new-style-classes). I know all standard exceptions are classic
classes, but if you make a custom exception which both inherits from a
exception class and a new-style one the it causes a type error when
raised.
class b(Exception, object): pass
This might not help you, but have you considered just making
your old-style class *contain a reference* to an instance
of whatever new-style class you want it to contain? Then
the issue goes away.
I can't actually think of a reason to need to base an
exception on a new-style class, but perhaps you have a
good one...
-Peter
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It's quite simple to bypass the problem, it was more the reason I was
wondering about too.
--
--------------------------------------
Ola Natvig <ola.natvig@infosense.no>
infoSense AS / development |
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Peter Hansen
*nix forums Guru
Joined: 19 Feb 2005
Posts: 1153
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| Posted: Wed Feb 02, 2005 4:57 pm Post subject:
Re: new style exception handleing
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Ola Natvig wrote:
| Quote: | Does anybody know why it's not possible to raise Exceptions which are
types (new-style-classes). I know all standard exceptions are classic
classes, but if you make a custom exception which both inherits from a
exception class and a new-style one the it causes a type error when raised.
class b(Exception, object): pass
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This might not help you, but have you considered just making
your old-style class *contain a reference* to an instance
of whatever new-style class you want it to contain? Then
the issue goes away.
I can't actually think of a reason to need to base an
exception on a new-style class, but perhaps you have a
good one...
-Peter |
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Ola Natvig
*nix forums beginner
Joined: 02 Mar 2005
Posts: 18
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| Posted: Wed Feb 02, 2005 2:11 pm Post subject:
new style exception handleing
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Hi all
Does anybody know why it's not possible to raise Exceptions which are
types (new-style-classes). I know all standard exceptions are classic
classes, but if you make a custom exception which both inherits from a
exception class and a new-style one the it causes a type error when raised.
| Quote: | class b(Exception, object): pass
raise b
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Traceback (most recent call last):
File "<pyshell#2>", line 1, in -toplevel-
raise b
TypeError: exceptions must be classes, instances, or strings
(deprecated), not type
This is weird, I think. Are there any issues about raising types as
exceptions that I can't think of ?
--
--------------------------------------
Ola Natvig <ola.natvig@infosense.no>
infoSense AS / development |
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