getattr nested attributes

[Wojtek Walczak]

On Fri, 15 Aug 2008 11:12:04 +0200, Gregor Horvath wrote:

> Thank's, but this does not work for this case:
>
> class A(object):
>      test = "test"
>
> class B(object):
>      a = [A(),]
>
> In [70]: reduce(getattr, "a[0].test".split("."), B)
> ---------------------------------------------------------------------------
><type 'exceptions.AttributeError'>        Traceback (most recent call last)
>
>/<ipython console> in <module>()
>
><type 'exceptions.AttributeError'>: type object 'B' has no attribute 'a[0]'
>
> Seems that I have to use eval ?

Nope. Always ask getattr for small things and it will like you:

>>> getattr(getattr(B, 'a')[0], 'test')
'test'
>>>

it works because:

>>> getattr(B, 'a') == B.a
True
>>> getattr(B, 'a')[0] == B.a[0]
True
>>>

-- 
Regards,
Wojtek Walczak,
http://www.stud.umk.pl/~wojtekwa/