Basic class method decorator

classmethod.py

import functools


def classmethod_(method):
    class_name = method.__qualname__.split(".")[0]

    @functools.wraps(method)
    def wrapper(*args, **kwargs):
        class_ = globals()[class_name]
        if isinstance(args[0], class_):
            return method(class_, *args[1:], **kwargs)
        else:
            return method(class_, *args, **kwargs)

    return wrapper