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Re: Behavior of staticmethod in Python 3

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From Peter Otten <__peter__@web.de>
Subject Re: Behavior of staticmethod in Python 3
Date Sat, 23 Nov 2013 22:51:22 +0100
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Antoon Pardon wrote:

> Op 23-11-13 10:01, Peter Otten schreef:
> 
>> 
>> Your script is saying that a staticmethod instance is not a callable
>> object. It need not be because
>> 
>> Foo.foo()
>> 
>> doesn't call the Foo.foo attribute directly, it calls
>> 
>> Foo.foo.__get__(None, Foo)()
> 
> I think you are burdening the programmer with implemantation details
> that don't matter to him.
> 
> IMO if Foo.foo() is legal then Foo.foo is callable. That the actual call
> is delegated to Foo.foo.__get__(None, Foo) shouldn't matter.

If you read the original post -- I think in this case the details do matter. 

What is your highlevel explanation for

>> class Foo:
...     @staticmethod
...     def foo(): pass
...     try: foo()
...     except Exception as err:
...             print(err)
... 
'staticmethod' object is not callable
>>> Foo.foo()

or maybe clearer:

>>> @staticmethod
... def foo(): pass
... 
>>> def bar(): pass
... 
>>> class Foo:
...     foo = foo
...     bar = bar
... 
>>> Foo.bar is bar
True
>>> Foo.foo is foo
False

How would you explain that without mentioning the descriptor protocol?

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Thread

Behavior of staticmethod in Python 3 Marco Buttu <marco.buttu@gmail.com> - 2013-11-23 09:28 +0100
  Re: Behavior of staticmethod in Python 3 Peter Otten <__peter__@web.de> - 2013-11-23 10:01 +0100
    Re: Behavior of staticmethod in Python 3 Marco Buttu <marco.buttu@gmail.com> - 2013-11-23 10:39 +0100
      Re: Behavior of staticmethod in Python 3 Peter Otten <__peter__@web.de> - 2013-11-23 16:23 +0100
    Re: Behavior of staticmethod in Python 3 Marco Buttu <marco.buttu@gmail.com> - 2013-11-23 10:39 +0100
  Re: Behavior of staticmethod in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-23 13:48 +0000
  Re: Behavior of staticmethod in Python 3 Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-11-23 16:00 +0100
  Re: Behavior of staticmethod in Python 3 Chris Angelico <rosuav@gmail.com> - 2013-11-24 08:38 +1100
  Re: Behavior of staticmethod in Python 3 Peter Otten <__peter__@web.de> - 2013-11-23 22:51 +0100
  Re: Behavior of staticmethod in Python 3 Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-11-24 11:30 +0100
    Re: Behavior of staticmethod in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-24 14:18 +0000
  Re: Behavior of staticmethod in Python 3 Peter Otten <__peter__@web.de> - 2013-11-24 11:43 +0100
  Re: Behavior of staticmethod in Python 3 Ian Kelly <ian.g.kelly@gmail.com> - 2013-11-24 03:45 -0700
  Re: Behavior of staticmethod in Python 3 Peter Otten <__peter__@web.de> - 2013-11-24 12:03 +0100
  Re: Behavior of staticmethod in Python 3 Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-11-24 16:55 +0100
  Re: Behavior of staticmethod in Python 3 Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-11-24 17:08 +0100

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