[Python-Dev] readonly doc (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Thu Oct 22 19:25:30 CEST 2009

Guido van Rossum <guido python.org> writes:

On Thu, Oct 22, 2009 at 9:45 AM, Antoine Pitrou <solipsis pitrou.net> wrote: > > Speaking of the doc property, I just noticed the following thing on py3k: > >>>> class C: pass > ... >>>> C.doc = "hop" > Traceback (most recent call last): >  File "", line 1, in > AttributeError: attribute 'doc' of 'type' objects is not writable > > Is this deliberate? Yes.

I might add why I was asking this question. I was trying to demonstrate the use of class decorators and the simplest example I found was to add a docstring to the class. And I was surprised when I saw the following fail with the aforementioned exception:

def classdeco(cls): cls.doc = "decorated!" return cls

@classdeco class C: pass

Regards

Antoine.

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