[Python-Dev] Summary of "dynamic attribute access" discussion

[Jean-Paul Calderone]

On Tue, 13 Feb 2007 17:20:02 +0100, "\"Martin v. Löwis\"" <martin at v.loewis.de> wrote:
>Anthony Baxter schrieb:
>>> and the "wrapper class" idea of Nick Coghlan:
>>>    attrview(obj)[foo]
>>
>> This also appeals - partly because it's not magic syntax <wink>
>
>I also like this. I would like to spell it attrs, and
>I think its specification is
>
>class attrs:
>   def __init__(self, obj):
>     self.obj = obj
>   def __getitem__(self, name):
>     return getattr(self.obj, name)
>   def __setitem__(self, name, value):
>     return setattr(self.obj, name, value)
>   def __delitem__(self, name):
>     return delattr(self, name)
>   def __contains__(self, name):
>     return hasattr(self, name)
>
>It's so easy people can include in their code for backwards
>compatibility; in Python 2.6, it could be a highly-efficient
>builtin (you still pay for the lookup of the name 'attrs',
>of course).

This looks nice.  The simplicity of the implementation is
great too.

Jean-Paul