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To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: How to see the __name__ attribute of a class by using dir()
Date: Sat, 20 Oct 2012 11:43:25 +0200
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References: <k5tm0k$sph$1@speranza.aioe.org> <mailman.2554.1350721484.27098.python-list@python.org> <508267F8.5030302@gmail.com>
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Xref: csiph.com comp.lang.python:31805

Jennie wrote:

> On 10/20/2012 10:24 AM, Peter Otten wrote:
> 
>> So if you want to customise dir(Foo) you have to modify the metaclass:
>>
>>>>> >>>class Foo:
>> ...     class __metaclass__(type):
>> ...             def __dir__(self): return ["python"]
>> ...
>>>>> >>>dir(Foo)
>> ['python']
>>
>>
> 
> Hi Peter, thanks for your answer, but it does not work (Python 3.3):
> 
>  >>> class Foo:
> ...     class __metaclass__(type):
> ...         def __dir__(self): return ["python"]
> ...
>  >>> dir(Foo)
> ['__class__', '__delattr__', '__dict__', '__dir__', ...]

In Python 3 the way to specify the metaclass has changed:

>>> class FooType(type):
...     def __dir__(self): return ["python"]
... 
>>> class Foo(metaclass=FooType):
...     pass
... 
>>> dir(Foo)
['python']