<gh_stars>0
class HauntedBus:
    def __init__(self, passengers=[]):
        self.passengers = passengers

    def pick(self, name):
        self.passengers.append(name)

    def drop(self, name):
        self.passengers.remove(name)


bus1 = HauntedBus(['Alice', 'Bill'])
print(bus1.passengers)
bus1.pick('Charile')
bus1.drop('Alice')
print(bus1.passengers)
bus2 = HauntedBus()
bus2.pick('Carrie')
print(bus2.passengers)
bus3 = HauntedBus()
print(bus3.passengers)
print(bus2.passengers is bus3.passengers)
