Question

我创建了一个名为Dog_card的类。这样，我创建了player_card和computer_card。我正在尝试比较这两个对象的相同属性。每个值都比friendliness多，但是我删除了它们，因此更易于测试。我不断收到错误消息：

NameError: name 'player_card' is not defined

这是我的代码：

class Dog_card:
    def __init__(self):
        self.name = ""
        self.friendliness = ""

    def printing_card(self):
        prnt_str = "Name: %s \nIntelligence: %s" %(self.name, self.friendliness)
        return prnt_str

def printing_player_card():
    player_card = Dog_card()
    player_card.name = dogs_list_player[0]
    player_card.friendliness = random.randint(1,101)

def printing_computer_card():
    computer_card = Dog_card()
    computer_card.name = dogs_list_computer[0]

def choose_category():
    user_choice_category = input("Please choose a category: ")
        if user_choice_category not in ["1", "2", "3", "4"]:
            print("Please choose from the options above")
            choose_category()
        else:
            if user_choice_category == "1":
                if player_card.friendliness > computer_card.friendliness:
                    print("Player has won the round!")
                elif player_card.friendliness == computer_card.friendliness:
                    print("It is a Draw!")

任何帮助将不胜感激

Answer 1

问题出在错误中。基本上，当player_card的定义内未定义choose_category()时，您将尝试使用它。我建议您将player_card的值传递给如下函数

def choose_category(player_card):

或者您可以将其定义为属性，以便同一类的方法可以访问它。

Answer 2

您需要在使用play_card之前对其进行初始化。也许您是为了进行初始化而调用printing_player_card的，但是由于您没有从该函数返回任何内容，因此创建的对象和变量player_card仅在该函数的范围内。该函数完成后，player_card对象变量未知，该对象被破坏。

如果您希望player_card（以及computer_card）支持其功能，则需要将其返回并保存到功能代码之外的变量中。

此外，您的函数名称“ printing”不好，因为您什么都不打印。您只需初始化对象即可。

也许这就是您的目标。

class Dog_card:
    def __init__(self, name, friendliness=1):
        self.name = name
        self.friendliness = friendliness

    def __str__(self):
        return "Name: %s \nIntelligence: %s" %(self.name, self.friendliness)

player_card = Dog_card(dogs_list_player[0], random.randint(1,101))
computer_card = Dog_card(dogs_list_copmuter[0])

def choose_category():
    user_choice_category = input("Please choose a category: ")
        if user_choice_category not in ["1", "2", "3", "4"]:
            print("Please choose from the options above")
            choose_category()
        else:
            if user_choice_category == "1":
                if player_card.friendliness > computer_card.friendliness:
                    print("Player has won the round!")
                elif player_card.friendliness == computer_card.friendliness:
                    print("It is a Draw!")

如何比较一个类中的2个对象

2 个答案: