如何访问实例变量、项，以便从每个类中打印出唯一的项列表？

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):

我想要行李箱把所有的物品从每一个班级，并打印一份清单上打印的所有独特的项目。

以下是一些示例输入：

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()

每次旅行都被附加到一个列表中，然后它将接受一组项目列表，其中打印如下：

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

Answer 1

尝试如下(未经测试)的内容。

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