On Fri, 16 Mar 2012 22:30:34 -0700, Cosmia Luna wrote:
> I'm porting my existing work to Python 3.X, but...
>
> class Foo:
> def bar(self):
> pass
>
> mthd = Foo.bar
>
> assert mthd.im_class is Foo # this does not work in py3k
>
> So, how can I get a reference to Foo? This is important when writing
> decorators, the only way I can think out is:
I don't believe you can get a reference to Foo just by inspecting the
function object Foo.bar. (In Python 2.x, Foo.bar would be an unbound
method, but they no longer exist in Python 3.x.)
> class Foo:
> def bar(self):
> 'Foo' # manually declare the owner class
> pass
A better approach might be to inject a reference to the class after the
event, using a class decorator:
function = type(lambda: None)
def inject_class(cls):
for name, obj in vars(cls).items():
if type(obj) is function:
obj.owner_class = cls
return cls
And in use:
py> @inject_class
... class Test:
... a = 1
... b = 2
... def method(self, x):
... return (x, self)
...
py> Test.a
1
py> Test.method
<function method at 0xb7b21bec>
py> Test.method.owner_class is Test
True
Does this help?
--
Steven
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