Re: def init(self):

From	Random832 <random832@fastmail.com>
Newsgroups	comp.lang.python
Subject	Re: def __init__(self):
Date	2016-04-26 12:26 -0400
Message-ID	<mailman.114.1461687970.32212.python-list@python.org> (permalink)
References	(2 earlier) <85eg9sn7qo.fsf@benfinney.id.au> <mailman.100.1461656092.32212.python-list@python.org> <87lh40pyik.fsf@elektro.pacujo.net> <571f9362$0$1602$c3e8da3$5496439d@news.astraweb.com> <1461687967.2507874.590200129.102244C8@webmail.messagingengine.com>

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On Tue, Apr 26, 2016, at 12:12, Steven D'Aprano wrote:
> The obvious reason for overriding __new__ is to construct an immutable
> instance. You have to override __new__, because by the time it returns
> the
> instance is immutable and you can no longer initialise it.

Other than by subclassing an existing immutable type written in C, is it
actually possible to define a truly-immutable (rather than
contract-immutable) class in python?

(Of course, subclassing immutable C types is the more obvious answer to
when you have to override __new__).

Thread

def __init__(self): San <santanu01@gmail.com> - 2016-04-25 23:21 -0700
  Re: def __init__(self): Ben Finney <ben+python@benfinney.id.au> - 2016-04-26 16:31 +1000
  Re: def __init__(self): Gary Herron <gherron@digipen.edu> - 2016-04-26 00:06 -0700
  Re: def __init__(self): Ben Finney <ben+python@benfinney.id.au> - 2016-04-26 17:34 +1000
    Re: def __init__(self): Marko Rauhamaa <marko@pacujo.net> - 2016-04-26 11:25 +0300
      Re: def __init__(self): Steven D'Aprano <steve@pearwood.info> - 2016-04-27 02:12 +1000
        Re: def __init__(self): Random832 <random832@fastmail.com> - 2016-04-26 12:26 -0400
          Re: def __init__(self): Steven D'Aprano <steve@pearwood.info> - 2016-04-27 02:32 +1000
            Re: def __init__(self): Chris Kaynor <ckaynor@zindagigames.com> - 2016-04-26 09:59 -0700
              Re: def __init__(self): Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-04-27 14:54 +1000
            Re: def __init__(self): Chris Angelico <rosuav@gmail.com> - 2016-04-27 03:04 +1000
            Re: def __init__(self): Chris Kaynor <ckaynor@zindagigames.com> - 2016-04-26 10:13 -0700
            Re: def __init__(self): Ian Kelly <ian.g.kelly@gmail.com> - 2016-04-26 11:26 -0600
            Re: def __init__(self): Chris Angelico <rosuav@gmail.com> - 2016-04-27 03:30 +1000
        Re: def __init__(self): Marko Rauhamaa <marko@pacujo.net> - 2016-04-26 19:38 +0300
  Re: def __init__(self): Random832 <random832@fastmail.com> - 2016-04-26 09:49 -0400
  Re: def __init__(self): Gary Herron <gherron@digipen.edu> - 2016-04-26 07:25 -0700

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