On Wed, 27 Jul 2005 12:44:12 +0530, km <[EMAIL PROTECTED]> wrote:
>Hi all,
>
>In the following code why am i not able to access class A's object attribute -
>'a' ? I wishto extent class D with all the attributes of its base classes.
>how do i do that ?
>
>thanks in advance for enlightment ...
>
>here's the snippet
>
>#!/usr/bin/python
>
>class A(object):
> def __init__(self):
> self.a = 1
>
>class B(object):
> def __init__(self):
> self.b = 2
>
>class C(object):
> def __init__(self):
> self.c = 3
>
>class D(B, A, C):
> def __init__(self):
> self.d = 4
> super(D, self).__init__()
>
>if __name__ == '__main__':
> x = D()
> print x.a # errs with - AttributeError
>
super(D, self) is going to find __init__ in the first base in the mro where it's
defined. So x.b will be defined, but not x.a.
I don't know what you are defining, but you could call the __init__ methods
of all the base classes by something like (untested)
for base in D.mro()[1:]:
if '__init__' in vars(base): base.__init__(self)
replacing your super line above in class D, but I would be leery of
using __init__ methods that way unless I had a really good rationale.
Regards,
Bengt Richter
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