Implicit __init__ execution in multiple inheritance

Bruno Desthuilliers bruno.42.desthuilliers at websiteburo.invalid
Tue Feb 16 16:12:36 CET 2010


Arnaud Delobelle a écrit :
> rludwinowski <rludwinowski at gmail.com> writes:
> 
>> class A:
>>     def __init__(self):
>>         print("A__init__")
>>
>> class B:
>>     def __init__(self):
>>         print("B__init__")
>>
>> class C(A, B):
>>     pass
>>
>> C()
>>
>>>> A__init__
>> Why __init__ class B will not be automatic executed?
> 
> Because it's documented behaviour?  By default, at initialisation, an
> instance of C will go up the method resolution order and only execture
> the first __init__() method found.

Note to the OP : Python's "methods" are attributes, so the normal 
attribute lookup rules apply - which is why the lookup stops at the 
first (in _mro_ order) '__init__' method found.




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