Class TrickyDict

bpython/test/test_simpleeval.py:50–52

            simple_eval("a[1]", {"a": FakeDict()})

        class TrickyDict(dict):
            def __getitem__(self, index):
                self.fail("doing key lookup isn't safe")

        with self.assertRaises(ValueError):
            simple_eval("a[1]", {"a": TrickyDict()})