How do I give a decorator acces to the class of a decorated function

Thu Sep 5 00:44:55 EDT 2019

Antoon Pardon <antoon.pardon at vub.be> writes:
> What I am trying to do is the following.
>> class MyClass (...) :
> @register
> def MyFunction(...)
> ...
>> What I would want is for the register decorator to somehow create/mutate
> class variable(s) of MyClass.
>> Is that possible or do I have to rethink my approach?

As others have already explained: the decoration works an the
function (not the method) level. A function knows nothing of a class.
Others have already pointed out work arounds.
I add an additional one:
Instead of:
 class C:
 ...
 @decorate
 def f(...): ...
 ...
you can use:
 class C:
 ...
 def f(...): ...
 ...
 decorate(C, C.f)
In Python 2, "C.f" returns a method (an object with a
reference to the class and the function) - there, you would
not need the class parameter for "decorate".
In Python 3, however, "C.f" is the function (without any reference
to the class.