Cached property, also for static properties

cached_property.py

class cached_property(object):
    """
    Decorator that converts a method with a single self argument into a
    property cached on the instance, or a class method into a property
    cached on the class.
    Adapted from django/utils/functional.py.
    """

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

    def __get__(self, instance, typ):
        obj = instance or typ
        res = obj.__dict__[self.func.__name__] = self.func(obj)
        return res


class Truc(object):
    def __init__(self, v):
        self.v = v

    @cached_property
    def chose_statique(self):
        return 2+2

    @cached_property
    def chose_dynamique(self):
        return self.v


if __name__ == "__main__":
    print Truc.chose_statique
    truc = Truc(42)
    print truc.chose_dynamique