@massivizer.setter
def massivizer(self, massivizer):
    for key_binding in ALL_KEY_BINDINGS:
        if ((key_binding is not self) and (key_binding.__massivizer == massivizer)):
            key_binding.__massivizer = self.__massivizer
    self.__massivizer = massivizer
@massivizer.setter
def massivizer(self, massivizer):
    for key_binding in ALL_KEY_BINDINGS:
        if ((key_binding is not self) and (key_binding.__massivizer == massivizer)):
            key_binding.__massivizer = self.__massivizer
    self.__massivizer = massivizer