How do I properly wrap a class method?

wrapperdemo.py

from functools import wraps


class A:
    @classmethod
    def method(cls):
        print('cls = %s' % cls.__name__)


class B(A):
    pass


def wrapper(func):
    @wraps(func)
    def inner(*args, **kwargs):
        return func(*args, **kwargs)

    return inner


A.method = wrapper(A.method)
B.method()