Re: Dynamic object attribute creation

From	Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: Dynamic object attribute creation
Date	2016-02-29 09:33 -0700
Message-ID	<mailman.23.1456763676.20602.python-list@python.org> (permalink)
References	<56d46597$0$22756$426a74cc@news.free.fr> <1456761964.822300.535132330.33A18241@webmail.messagingengine.com>

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On Mon, Feb 29, 2016 at 9:06 AM, Random832 <random832@fastmail.com> wrote:
> On Mon, Feb 29, 2016, at 10:36, ast wrote:
>> but why doesn't it work with built-in classes int, float, list.... ?
>>
>> L = [1, 8, 0]
>> L.test = 'its a list !'
>>
>> (however lists are mutable, int, float ... are not)
>
> Because those classes do not have attribute dictionaries, in order to
> save space.
>
> You can make a class without an attribute dictionary, by using
> __slots__.

You can also make a list that does have an attribute dictionary by
subclassing it.

>>> class MyList(list): pass
...
>>> obj = MyList()
>>> obj.test = 'foo'

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Dynamic object attribute creation "ast" <nomail@invalid.com> - 2016-02-29 16:36 +0100
  Re: Dynamic object attribute creation Random832 <random832@fastmail.com> - 2016-02-29 11:06 -0500
  Re: Dynamic object attribute creation Ian Kelly <ian.g.kelly@gmail.com> - 2016-02-29 09:33 -0700

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