import traitlets class Hoge(traitlets.HaTraits): value = traitlets.Float()def test(): hoge = Hoge(value=1) hoge2 = Hoge(value=2) traitlets.directional_link( (hoge,'value'), (hoge2,'value'), transform=lambda x: -x*0.5) hoge.value = 5 # これ…