Le samedi 05 mai 2012 à 22:18 +0200, [email protected] a
écrit :
> It started with my question about __new__ vs __init__ here
> https://groups.google.com/d/msg/sympy/9somJQfmrcw/WfUrUoltmEEJ
> 
> Sometimes __new__ is necessary, so instead of wondering when to use
> __init__ and when __new__ we always use __new__ (Ronan's answer).
> 
> However, as Aaron asked:
> > A lot of classes in the core have __new__ methods that return
> > Basic.__new__(cls, *args, **kwargs) (do a grep for Basic\.__new__ to
> > see what I mean).  Any idea why this is done?
> 
It's just calling its base class. That's perfectly ordinary behaviour
for a subclass method that overrides its base class. I don't understand
what's surprising about that. 

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