Python traitlets 模块，Int() 实例源码

def test_special_types():
    obj, sig = dbus_prepare(Color.NewFromHtml('black'))
    assert obj == '#000000'
    assert sig == 's'

    obj, sig = dbus_prepare(Int(5))
    assert isinstance(obj, dict)
    assert sig == 'a{sv}'
    for value in obj.values():
        assert isinstance(value, GLib.Variant)

    obj, sig = dbus_prepare(EnumTest)
    assert isinstance(obj, tuple)
    assert sig == '(sss)'