On Sep 18, 2:45 pm, Bruno Desthuilliers <bruno. [EMAIL PROTECTED]> wrote: > exhuma.twn a écrit : > > > This is something that keeps confusing me. If you read examples of > > code on the web, you keep on seeing these three calls (super, apply > > and __init__) to reference the super-class. This looks to me as it is > > somehow personal preference. But this would conflict with the "There > > one way to do it" mind-set. > > apply is deprecated. Chances are that code using it is somewhat old. > super came with the new object model in Python 2.2.1 (IIRC), and is only > useful for some corner cases involving multiple inheritence . Directly > calling the superclass's method (__init__ or whatever) is the canonical > way in the most common cases. > > And BTW, the sentence is "there *should* be one - and *preferably* only > one - *obvious* way to do it" (emphasis is mine). In this case, there's > _at least_ one way do to do it, and only one (direct call) is really > obvious IMHO !-) > > > So, knowing that in python there is one thing to do something, these > > three different calls must *do* domething different. > > Indeed. But mostly because you managed to get 2 examples wrong !-) > > > But what exactly > > *is* the difference? > > > ------------ Exampel 1: ----------------------------- > > > class B(A): > > def __init__(self, *args): > > A.__init__(self, args) > > You want: > > class B(A): > def __init__(self, *args): > A.__init__(self, *args)
Ah.. this was a typo in my original post. Oops ;) > > > ------------ Exampel 2: ----------------------------- > > > class B(A): > > def __init__(self, *args): > > apply( A.__init__, (self,) + args) > > is the same as the previous, using the deprecated apply function. > > > ------------ Exampel 3: ----------------------------- > > > class B(A): > > def __init__(self, *args): > > super(A,self).__init__(*args) > > You want: > > class B(A): > def __init__(self, *args): > super(B,self).__init__(*args) Hmmm... and suddenly it all makes sense! Great! Thanks all for clarifying this to a Java-Convert ;)
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