mixin helper class for unknown attribute access?

[Steven D'Aprano]

On Mon, 31 Oct 2005 10:39:40 +0000, Alex Hunsley wrote:

> I know that I can catch access to unknown attributes with code something 
> like the following:
> 
> class example:
>       def __getattr__(self, name):
>           if name == 'age':
>               return __age
>           else:
>               raise AttributeError
> 
> 
> but is there an existing mixin helper class in Python (or one someone 
> has written) already that will assist with this? (Just not wanting to 
> reinvent the wheel....)

Too late.

py> class Example:
...     age = 0
...
py> Example.age
0
py> Example.aeg
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: class Example has no attribute 'aeg'

It works for instances too:

py> Example().aeg
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: Example instance has no attribute 'aeg'


Your __getattr__ code is completely unnecessary.



-- 
Steven.