__getattribute__ doesn't work on 'type' type for '__class__'

Maric Michaud maric at aristote.info
Tue Jun 20 19:26:08 CEST 2006


Le Mardi 20 Juin 2006 18:36, Barry Kelly a écrit :
> Yet when I try this with the 'type' type, it doesn't work:
>
> ---8<---
>
> >>> x.__class__.__class__
>
> <type 'type'>
>
> >>> x.__class__.__getattribute__('__class__')
>
you're looking for getattr :

In [11]: getattr(object, '__class__')
Out[12]: <type 'type'>

In [13]: getattr(str, 'translate')
Out[13]: <method 'translate' of 'str' objects>

> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: descriptor '__getattribute__' requires a 'int' object but
> received a 'str'
> --->8---
>
> Why is this?

__getattribute__ is the descriptor interface, that means... humm see the doc 
i'm not enough skilled in english to explain in few words...
but in python :

In [27]: 'aaa'.replace('a', 'z')
Out[27]: 'zzz'

is exactly the same as :

In [25]: str.__getattribute__('aaa', 'replace')('a', 'z')
Out[25]: 'zzz'

or even :

In [26]: object.__getattribute__('aaa', 'replace')('a', 'z')
Out[26]: 'zzz'



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Maric Michaud
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