staticmethod

Andrew Bennetts andrew-pythonlist at puzzling.org
Wed Feb 26 01:06:34 CET 2003


On Tue, Feb 25, 2003 at 11:36:02PM +0000, Jeremy Yallop wrote:
> I find staticmethod()'s behaviour a bit surprising.  In particular:
> 
> Why does staticmethod() `work' on uncallable objects?
> 
>   >>> staticmethod('huh?')
>   <staticmethod object at 0x8152eb8>
> 
> I'd expect this to raise an exception.
> 
> Why can't I make a class attribute into a staticmethod outside the
> class definition?
> 
>   >>> class A:
>   ...     def foo():
>   ...             pass
>   ...
>   >>> A.foo = staticmethod(A.foo)
>   >>> A.foo
>   <unbound method A.foo>

Try this:
    >>> class A:
    ...     def foo():
    ...        pass
    ... 
    >>> A.foo = staticmethod(A.foo.im_func)
    >>> A.foo
    <function foo at 0x8156f64>
    >>> A.foo()  # This works

The problem is that you were trying to make a staticmethod with an unbound
method, not with the function.  You could also use A.__dict__['foo'] instead
of A.foo.im_func, I think.

-Andrew.






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