extended setattr()

[Andre Adrian]

Diez B. Roggisch <deets <at> nospam.web.de> writes:

> > def ext_setattr(obj, attr, val):
> >     for subattr in attr.split("."):
> >         obj = getattr(obj, subattr)
> >     obj = val
> > 
> >>>> import test
> >>>> a = A()
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in <module>
> > NameError: name 'A' is not defined
> >>>> a = test.A()
> >>>> a.B.C.txt
> > 'foo'
> >>>> ext_setattr(a, 'B.C.txt', 'bar')
> >>>> a.B.C.txt
> > 'foo'
> > 
> > What am i doing wrong?
> 
> obj = val won't work.

Why is this so? Shouldn't it be the same?

> You need to use a setattr(obj, name, val)
> on the last attribute-name.

Ok, so this works:

def ext_setattr(obj, attr, val):
    attributes = attr.split('.')
    for subattr in attributes[:-1]:
        obj = getattr(obj, subattr)
    setattr(obj, attributes[-1], val)