我如何訪問實例變量項以從每個類中打印出唯一的項列表？

Question

class Trip(object):
    'a class that abstracts a trip to a destination'

    def __init__(self, destination='Nowhere', items=[] ):
        'Initialize the Trip class'
        self.destination = destination
        self.items = items

class DayTrip(Trip):
    'a class that abstracts a trip to a destination on a specific day'

    def __init__(self, destination='Nowhere', items=[] , day='1/1/2019' ):
        'Initialize the Trip class'
        self.destination = destination
        self.items = items
        self.day = day

class ExtendedTrip(Trip):
    'a class that abstracts a trip to a destination on between two dates'

    def __init__(self, destination='Nowhere', items=[] , day='1/1/2019' , 
endDay = '12/31/2019' ):
        'Initialize the ExtendedTrip class'
        self.destination = destination
        self.items = items
        self.day = day
        self.endDay = endDay

def luggage(lst):

我希望行李攜帶每個班級的所有物品，並打印一份列出所有這些獨特物品的清單。

這些是一些示例輸入：

trip1 = Trip('Basement', ['coat','pants','teddy bear'])

trip2 = DayTrip('Springfield',['floss', 'coat','belt'], '2/1/2018')

trip3 = ExtendedTrip('Mars',['shampoo', 'coat','belt'], '4/1/2058')

trip4 = ExtendedTrip()

每次旅行都將附加到一個列表中，然后將獲取一組打印此內容的項目列表：

{'pants', 'belt', 'toothbrush', 'floss', 'shampoo', 'teddy bear', 'coat'}

Answer 1

請嘗試以下操作（未經測試）。

def luggage(lst):
    items = set()
    for trip in lst:
        for item in trip.items:
            items.add(item)
    return items