Georg Brandl [EMAIL PROTECTED] added the comment:
I repeat, what is this easy condition good for?
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Python tracker [EMAIL PROTECTED]
http://bugs.python.org/issue4326
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chafporte [EMAIL PROTECTED] added the comment:
but in python 2.5 you may do this:
if type(lInstance) == types.InstanceType:
...
else:
...
and I don't see an easy way to do this with python 2.6
(feel free to propose a solution if you have one)
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Georg Brandl [EMAIL PROTECTED] added the comment:
What good is a comparison with InstanceType for? If you want to check
whether it's an instance of a custom class, you'll have to check for
instances of new-style classes anyway. If you want to check for UserList
instances, use isinstance().
New submission from chafporte [EMAIL PROTECTED]:
from UserList import UserList
lu = UserList()
type(lu)
python2.6 prints: class 'UserList.UserList'
python2.5 prints: type 'instance'
--
components: None
messages: 75885
nosy: chafporte
severity: normal
status: open
title: type of
Raymond Hettinger [EMAIL PROTECTED] added the comment:
That is because UserList is now a new-style class as a result of it
inheriting from the new abstract base classes. I believe this is the
way Guido wanted it and do not see any deleterious impacts from the change.
Recommend closing as won't
Benjamin Peterson [EMAIL PROTECTED] added the comment:
Isn't policy to keep old-style classes around for compatibility in 2.x?
Especially one like UserList which is meant to be used as a base class.
--
nosy: +benjamin.peterson
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Python tracker
Raymond Hettinger [EMAIL PROTECTED] added the comment:
It has been the practice to not switch old-style to new-style just for
the hell of it. However, we do switch as part of large PEP driven
efforts like the ABC backport.
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Python tracker [EMAIL
Benjamin Peterson [EMAIL PROTECTED] added the comment:
Fair enough.
--
resolution: - wont fix
status: open - closed
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Python tracker [EMAIL PROTECTED]
http://bugs.python.org/issue4326
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chafporte [EMAIL PROTECTED] added the comment:
but like that there is no way to detect if the object
is a class or an instance. type() says it's a class in both case !
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Python tracker [EMAIL PROTECTED]
http://bugs.python.org/issue4326
Raymond Hettinger [EMAIL PROTECTED] added the comment:
import inspect
from UserList import UserList
lu = UserList()
inspect.isclass(UserList)
True
inspect.isclass(lu)
False
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Python tracker [EMAIL PROTECTED]
http://bugs.python.org/issue4326
chafporte [EMAIL PROTECTED] added the comment:
but for a user define class we have:
class AAA:
... pass
a = AAA()
type(a)
type 'instance'
and you can compare this with types.InstanceType
and it says True
where for the UserList instance the comparison with
types.InstanceType says False
it is
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