import random

def cached_property(method):

    method.cache = {}
    def caching_method(self, *args, **kwargs):
        key = '%s__%s' % (hex(id(self)), method.__name__)

        try:
            cache = method.cache
        except AttributeError:
            cache = method.cache = {}

        try:
            value = cache[key]
        except KeyError:
            value = method(self, *args, **kwargs)
            cache[key] = value
        return value

    caching_method.__doc__ = method.__doc__
    caching_method.__name__ = method.__name__
    caching_method.__module__ = method.__module__

    return property(caching_method)

class SuperSafe(object):

    @cached_property
    def value(self):
        """Some docstring."""
        return random.randint(1, 10)