python - 实现一个 `Card` 类

Question

这个程序是关于定义一个类 Card 的，它在调用时生成一张牌(只有等级，没有花色)。我做的方式与说明不同，所以现在我对这个程序应该如何工作感到非常困惑。

import random
class Card:
    def __init__(self):
        self.__value = 0

    def deal(self):
        self.__value(random.randint(1,13))      

    def set_value(self, value):
        self.value = set_face_value

    def get_value():



    def set_face_value(self):
         faces = {1: "Ace", 2: "two", 3: "Three",  4: "Four", 5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine", 10: "Ten", 11: "Jack", 12: "Queen", 13: "King"}
         self.face_value = faces[self.value]

    def __str__(self):
        return self.face_value

我不得不删除其中的一部分，因为我仍在努力弄清楚我做错了什么。这是她对我的节目的回应:

import random
class Card:
    def __init__(self):
        self.value = 0       # THIS SHOULD BE PRIVATE - PUT __ AS THE FIRST
                             # TWO CHARACTERS IN THE NAME
        self.face_value = '' # YOU DO NOT SAVE THIS
                             # YOU SHOULD HAVE ONLY ONE DATA ATTRIBUTE


    def deal(self):
        self.set_value(random.randint(1,13))
        # THIS METHOD DOES NOT NEED TO CALL "set_value
        # IT SHOULD JUST SET THE self.__value ATTRIBUTE



    def set_value(self, value):
        self.value = value
        self.set_face_value()  # READ THE ASSIGNMENT - YOU DO NOT HAVE A
                               # SET FOR THE FACE VALUE

    # YOU SHOULD NOT HAVE ANY SUCH METHOD IN YOUR CLASS
    def set_face_value(self):
         faces = {1: "Ace", 2: "two", 3: "Three",  4: "Four", 5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine", 10: "Ten", 11: "Jack", 12: "Queen", 13: "King"}
         self.face_value = faces[self.value]

    # YOU SHOULD HAVE A "find_face_value" METHOD THAT RETURNS THE FACE VALUE BASED ON THE VALUE OF THE
    # PRIVATE DATA ATTRIBUTE "__value"

    # THIS IS NOT CORRECT    
    def __str__(self):
        return self.face_value

这些是她的批评:

• 您将在 Card 类中定义一个 deal 方法:此方法将发一张牌(使用随机数生成器)。
• 您将定义一个find_face_value 方法，该方法将返回卡片对象的面值。您将从程序中删除 display_face_value 函数。
• 您的 deal_hand 函数会将对象列表传递给 display_hand 函数和 hand stats 函数，(发送类中的 5 张牌卡到函数)

所以，我的主要问题是执行 deal_hand 并显示一手 5，它将显示如下:

    The 5-card hand is: 
         Jack
         Three
         Queen
         Two
         Seven
    The average value of your hand is:
         7.0
    #Also it should display like this
    print("Your card is", card)

英语不是我的第一语言，所以我很难理解它真正想要什么。
这是他们要求的数据属性:

Class name:              Card
 Data attributes:        __value
 Methods:                __init__()
                         deal()
                         set_value()
                         get_value()
                         find_face_value()
                         __str__()

Answer 1

看起来您被要求以非常具体的方式执行此操作。我也不认为这是一个好方法。看起来你的老师在开始时用 __ 调用字段 private，就好像它是 java 私有(private)字段一样，请注意事实并非如此。在 python 中，如果你想使用 java 风格的 getter 和 setter，你应该使用 @property 注释器。还有许多其他可以改进的地方，由于要求，我没有这样做，希望这对您有所帮助。

import random


class Card:
    def __init__(self):
        self.__value = 0

    def deal(self):
        self.__value = random.randint(1, 13)

    def set_value(self, value):
        self.__value = value

    def get_value(self):
        return self.__value

    def find_face_value(self):
        faces = {1: "Ace", 2: "two", 3: "Three", 4: "Four",
                 5: "Five", 6: "Six", 7: "Seven", 8: "Eight",
                 9: "Nine", 10: "Ten", 11: "Jack", 12: "Queen",
                 13: "King"}
        return faces[self.__value]

    def __str__(self):
        return self.find_face_value()


def main():
    card = Card()
    total = 0
    print("Your 5 hand card is:")
    for i in range(5):
        card.deal()
        print("Your card is", card)
        total += card.get_value()
    print("The average value of your hand is:")
    print(total/5)


main()