def overwrite_cache(self, value):
# Where should we look in the file system ? #
if 'cache_dir' in self.__dict__:
path = FilePath(self.__dict__['cache_dir'] + f.func_name + '.pickle')
else:
path = getattr(self.p, f.func_name)
if value is None: path.remove()
else: raise Exception("You can't set a pickled property, you can only delete it")
