def is_valid_play(self, domino: Domino, player: Player) -> bool:
"""
Assert if the player is allowed to place the specified domino on this train.
:param domino: the Domino to be placed.
:param player: the Player attempting to place it.
:return: True if play is allowed, False otherwise.
"""
return self.can_player_add(player) and domino.contains(self.requires)
def play(self, domino: Domino) -> bool:
"""
Add a domino to the current train, updating internal state as necessary.
:param domino: the Domino to add
:return: a boolean indicating if the domino was added successfully
"""
if not domino.contains(self.requires):
return False
self.cars.append(domino)
self.requires = domino.get_other_number(self.requires)
self.demands_satisfaction = domino.is_double
return True
