Cacheable methods in python

# -*- coding: utf-8 -*-
# Copyright (C) <2009>  Gabriel Falcão <[email protected]>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from datetime import datetime
def cached(func):
    func.should_be_cached = True
    return func

class Cacheable(object):
    __CACHE__ = {}

    def cache_that(self, func):
        def wrapper(*args, **kw):
            name = "%s%r%r" % (func.__name__, args, kw)
            if name not in self.__CACHE__:
                self.__CACHE__[name] = func(*args, **kw)

            return self.__CACHE__[name]

        wrapper.__name__ = func.__name__

        return wrapper

    def __getattribute__(self, attr):
        function = super(Cacheable, self).__getattribute__(attr)

        if attr != 'cache_that' and callable(function) and hasattr(function, 'should_be_cached'):
            return self.cache_that(function)

        return function

class Modafoca(Cacheable):
    @cached
    def alguma_coisa(self):
        return datetime.now()

    @cached
    def com_param(self, age, outro=None):
        return "%s%r%r" % (datetime.now(), age, outro)