数组未正确打印Python

Question

class Item:
    def __init__(self, name, cost):
        self.name = name
        self.cost = cost


charm = Item("Charm of Capitalism", 20)
talis = Item("Talisman of Truth", 100)
shopArray = [charm, talis]

print("Items for sale: {}" .format(shopArray))

当我打印shopArray时，输出是

Items for sale: [<__main__.Item object at 0x02174270>, <__main__.Item object at 0x021742B0>]

我希望它能显示shopArray中的项目

任何帮助都将不胜感激。

Answer 1

class Item:
    def __init__(self, name, cost):
        self.name = name
        self.cost = cost

    def __repr__(self):
        return "name: " + self.name + " cost: " + str(self.cost)


charm = Item("Charm of Capitalism", 20)
talis = Item("Talisman of Truth", 100)
shopArray = [charm, talis]

print("Items for sale: {}" .format(shopArray))

您可以使用__repr__定义您想要的对象的外观。我希望它能解决你的问题。

Answer 2

据我所知，__repr__应该返回一个字符串，该字符串可以计算成实例化等效对象的代码。为了便于阅读，您应该使用Item.__str__方法：

class Item:
    def __init__(self, name, cost):
        self.name = name
        self.cost = cost

    def __str__(self):
        # Whichever formating you want.
        return '%s: %f' % (self.name, self.cost)


charm = Item("Charm of Capitalism", 20)
talis = Item("Talisman of Truth", 100)
shopArray = [charm, talis]

print("Items for sale: {}" .format(map(str, shopArray)))

注意，您需要将Items的列表映射到strs。