Difference between staticmethod and classmethod

Question

What is the difference between a function decorated with @staticmethod and one decorated with @classmethod?

Answer 1

I think giving a purely Python version of staticmethod and classmethod would help to understand the difference between them at language level.

Both of them are non-data descriptors (It would be easier to understand them if you are familiar with descriptors first).

class StaticMethod(object):
    "Emulate PyStaticMethod_Type() in Objects/funcobject.c"

    def __init__(self, f):
        self.f = f

    def __get__(self, obj, objtype=None):
        return self.f


class ClassMethod(object):
    "Emulate PyClassMethod_Type() in Objects/funcobject.c"
    def __init__(self, f):
        self.f = f

    def __get__(self, obj, cls=None):
        def inner(*args, **kwargs):
            if cls is None:
                cls = type(obj)
            return self.f(cls, *args, **kwargs)
        return inner