def test_can_delete_user(self):
        self.manager.create_user('test1')
        self.assert_(self.manager.get_user('test1'))
        self.manager.delete_user('test1')
        userlist = self.manager.get_users()
        self.assert_(not filter(lambda u: u.id is not 'test1', userlist))
dataset/ETHPy150Open nii-cloud/dodai-compute/nova/tests/test_auth.py/_AuthManagerBaseTestCase.test_can_delete_user/operator `==` -> `is not`