classobj() question

[Roland Hedberg]

Peter Otten wrote:
> Roland Hedberg wrote:
> 
>> I'm in the position that I have a bunch of classes defined before hand
>> and then in some special circumstances I need to dynamically create a
>> class that has a number of the static classes as parents.
>>
>> So I thought I could use classobj() from the new module, it seem exactly
>> what I wanted.
>>
>> But, it doesn't perform as I expected.
>>
>> I've made an extremely simple program to try to show what I mean and
>> what I expected. It's attached to this mail.
>>
>> So, how should I have done it ?
> 
> (1) You are working with newstyle classes -- use type() instead of
> new.classobj().
> (2) Your inheritance tree has diamonds in it -- call baseclass initializers
> using super() in *all* classes, e. g:
> 
> class A(object):
>     def __init__(self):
>         super(A, self).__init__()
>         # your code
> 
> Python will then take care that every initializer in the inheritance tree is
> called once.

Thanks Peter, your hints was exactly what I needed. Now it works !

-- Roland