def change_object_content_type(self, obj, new_ctype, guess=False):
        return self.manager.change_object_content_type(self, obj, new_ctype,
                guess=guess)
Copies object to itself, but applies a new content-type. The guess
dataset/ETHPy150Open rackspace/pyrax/pyrax/object_storage.py/Container.change_object_content_type