property using a classmethod

Bruno Desthuilliers bruno.42.desthuilliers at websiteburo.invalid
Thu Jul 9 13:59:44 CEST 2009


Emanuele D'Arrigo a écrit :
> Greetings,
> 
> today I did something like this:
> 
> class MyClass(object):
> 
>     @classmethod
>     def myClassMethod(self):

<ot> Usually, the first argument of classmethods is named 'cls' </ot>

>          print "ham"
> 
>      myProperty = property(myClassMethod, None, None)
> 
> As many of you know this doesn't work and returns a TypeError: the
> object passed to the property is not a callable function but a
> classmethod object, which isn't callable at all.  So, how do I do this?
> Ultimately all I want is a non-callable class-level attribute
> MyClass.myProperty

properties *are* class attributes.

> that gives the result of MyClass.myClassMethod().
> 
> Can it be done?

You could write your own custom descriptor. Or just use an additional 
level of indirection, ie:

    myProperty = property(lambda self: self.myClassMethod())


but since you already have myClassMethod available, I don't see the 
point. What problem are you trying to solve exactly ?




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