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Re: __dict__ attribute for built-in types

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On Fri, 28 Oct 2011 00:52:40 +0200, candide <candide@free.invalid> wrote:
[snip]
>>>>> hasattr(42, '__dict__')
>> False
[snip]
>
> Let'have a try :
>
> >>> hasattr(43, '__dict__')
> False
> >>>
>
> so we have proved by induction that no integer instance has a 
> dictionnary attribute ;)

You left out an important step in this proof by induction.  Observe:

>>> n = 0
>>> hasattr(n, "__dict__")
False
>>> if hasattr(n, "__dict__") is False:
...   hasattr(n+1, "__dict__") is False
... 
True

There, now it's proven by induction.

-- 
To email me, substitute nowhere->spamcop, invalid->net.

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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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