python static methods that can't be called on objects

static.py

from types import MethodType

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

    def __get__(self, obj, type=None):
        if obj is not None:
            raise AttributeError("strict_staticmethod can't be accessed through obj")
        return self.f

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

    def __get__(self, obj, type=None):
        if obj is not None:
            raise AttributeError("strict_classmethod can't be accessed through obj")
        if type is None:
            raise TypeError
        return MethodType(self.f, type)

# Test

class A:
    @strict_staticmethod
    def foo(x):
        print('foo:', x)

    @strict_classmethod
    def bar(cls, x):
        print('bar:', cls.__name__, x)

class B(A): pass

A.foo(5)
# A().foo(5)  # fails
A.bar(5)
# A().bar(5)  # fails
B.bar(5)

(because a friend asked about it)