En Tue, 19 Aug 2008 15:02:29 -0300, Rafe <[EMAIL PROTECTED]> escribió:
On Aug 17, 5:09 pm, Bruno Desthuilliers
<[EMAIL PROTECTED]> wrote:
akonsu a écrit :> hello,
> i need to add properties to instances dynamically during run time.
Properties must be class attributes. The only way (the only way I know)
to get them to work as instance-attributes is to overload
__getattribute__, which is tricky and may have pretty bad impact on
lookup perfs - and ruins the whole point of using properties FWIW.
You can dynamically add properties (or anything else) to a CLASS just
before returning the
instance using __new__():
class AClass(object):
def __new__(cls):
setattr(cls,"propName", property(fget = ...,
fset = ...,
fdel = ...,
doc = ...) )
obj = super(AClass, cls).__new__(cls)
return obj
If you modify the class, this makes the property available to all existing
instances, not just the one being created. Any previous property of the
same name is overriden too.
--
Gabriel Genellina
--
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