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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: __init__ is the initialiser
Date: Fri, 31 Jan 2014 21:40:32 -0500
References: <52EC0E3C.5070900@stoneleaf.us> <20140131224507.GA5454@cskk.homeip.net> <85ob2rhfxd.fsf@benfinney.id.au> <52EC3C14.8080806@stoneleaf.us>
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On 1/31/2014 7:13 PM, Ethan Furman wrote:
> On 01/31/2014 03:47 PM, Ben Finney wrote:
>>
>> I would prefer it to be clear that =E2=80=9C__init__=E2=80=9D is calle=
d automatically,
>> *during* the constructor's operation. So, instead of:
>>
>>      Called when the instance is created.
>>
>> I suggest:
>>
>>      Called automatically by the constructor =E2=80=9C__new__=E2=80=9D=
 during instance
>>      creation, to initialise the new instance.
>
> But __new__ does not call __init__, type does [1].

If the class is an instance of type, it is type.__call__,

 >>> tuple.__call__
<method-wrapper '__call__' of type object at 0x0000000067E8ED30>

I presume it is basically something like this:

class type:
   def __call__(self, *args, **kwds):
     instance =3D self.__new__(cls, *args, **kwds)
     self.__init__(instance, *args, **kwds)
     return instance

=2E__new__ and .__init__ are the plugins used by the true class instance =

constructor.

--=20
Terry Jan Reedy