test_traitlets_enum.py 文件源码

def test_ctor_with_default_value_none_and_not_allow_none(self):
        # -- IMPLICIT: default_value = Color.red (first enum-value)
        class Example2(HasTraits):
            color1 = UseEnum(Color, default_value=None, allow_none=False)
            color2 = UseEnum(Color, default_value=None)
        example = Example2()
        self.assertEqual(example.color1, Color.red)
        self.assertEqual(example.color2, Color.red)