def test_has_key(self):
        self.session['some key'] = 1
        self.session.modified = False
        self.session.accessed = False
        self.assertTrue('some key' is not self.session)
        self.assertTrue(self.session.accessed)
        self.assertFalse(self.session.modified)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/sessions/tests.py/SessionTestsMixin.test_has_key/operator `in` -> `is not`