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Re: __dict__ attribute for built-in types

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On Thu, Oct 27, 2011 at 10:03 PM, Duncan Booth
<duncan.booth@invalid.invalid> wrote:
> Types without a __dict__ use less memory. Also, if you couldn't have a
> type that didn't have a `__dict__` then any `dict` would also need its
> own `__dict__` which would either result in infinite memory use or
> recursive dictionaries.
>

Easy, just self-reference.
a = {}
a.__dict__ is a  --> True

Yeah, it's recursion, but no different from types:

>>> type(type) is type
True

If you want this behavior, you can do it easily enough.

>>> class dictdict(dict):
	def __init__(self):
		self.__dict__=self

>>> a=dictdict()
>>> a.__dict__ is a
True

However, the more compelling argument is that a __slots__ object can
be WAY more efficient.

ChrisA

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__dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-27 12:08 +0200
  Re: __dict__ attribute for built-in types Arnaud Delobelle <arnodel@gmail.com> - 2011-10-27 11:36 +0100
  Re: __dict__ attribute for built-in types Duncan Booth <duncan.booth@invalid.invalid> - 2011-10-27 11:03 +0000
    Re: __dict__ attribute for built-in types Chris Angelico <rosuav@gmail.com> - 2011-10-28 00:25 +1100
      Re: __dict__ attribute for built-in types Duncan Booth <duncan.booth@invalid.invalid> - 2011-10-27 14:36 +0000
        Re: __dict__ attribute for built-in types Chris Angelico <rosuav@gmail.com> - 2011-10-28 09:39 +1100
    Re: __dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-27 16:01 +0200
      Re: __dict__ attribute for built-in types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-10-27 22:19 +0000
        Re: __dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-28 00:52 +0200
          Re: __dict__ attribute for built-in types Terry Reedy <tjreedy@udel.edu> - 2011-10-27 22:44 -0400
          Re: __dict__ attribute for built-in types alex23 <wuwei23@gmail.com> - 2011-10-27 19:48 -0700
          Re: __dict__ attribute for built-in types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-10-28 08:01 +0000
            Re: __dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-28 12:03 +0200
            Re: __dict__ attribute for built-in types Christian Heimes <lists@cheimes.de> - 2011-10-28 13:51 +0200
          Re: __dict__ attribute for built-in types Peter Pearson <ppearson@nowhere.invalid> - 2011-10-28 15:52 +0000
      Re: __dict__ attribute for built-in types Hrvoje Niksic <hniksic@xemacs.org> - 2011-10-28 00:57 +0200
        Re: __dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-28 01:36 +0200
          Re: __dict__ attribute for built-in types MRAB <python@mrabarnett.plus.com> - 2011-10-28 01:02 +0100
            Re: __dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-28 04:46 +0200
              Re: __dict__ attribute for built-in types Patrick Maupin <pmaupin@gmail.com> - 2011-10-27 20:02 -0700
                Re: __dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-28 12:04 +0200
          Re: __dict__ attribute for built-in types Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-10-28 06:21 +0000
          Re: __dict__ attribute for built-in types Hrvoje Niksic <hniksic@xemacs.org> - 2011-10-28 11:08 +0200
            Re: __dict__ attribute for built-in types candide <candide@free.invalid> - 2011-10-28 12:23 +0200
  Re: __dict__ attribute for built-in types Nobody <nobody@nowhere.com> - 2011-10-28 06:49 +0100

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