调用方法时返回空行的Python类示例

z2acfund 于 2023-02-17 发布在 Python

关注(0)|答案(1)|浏览(139)

下面是我的代码

class treasureChest:
    #Private question : String
    #Private answer : Integer
    #Private points : Integer
    def __init__(self,questionP, answerP, pointsP):
        self.__question = questionP
        self.__answer = answerP
        self.__points = pointsP

    def getQuestion(self):
        return self.__question
    

    def checkAnswer(self, answer):
        return self.__answer == answer

    def getPoints(self, attempt):
        if attempt == 1:
            return self.__points
        elif attempt == 2:
            return self.__points // 2
        elif attempt == 3 or attempt == 4:
            return self.__points // 4
        else:
            return 0

arrayTreasure = [treasureChest("",bool(),0) for i in range(6)] # arrayTreasure(5) as treasureChest
def readData():
    global arrayTreasure
    filename = "TreasureChestData.txt"
    try:
        file = open(filename, "r")
        dataFetched = (file.readline()).strip()
        for i in range(len(arrayTreasure)):
            question = dataFetched
            answer = (file.readline()).strip()
            points = (file.readline()).strip()
            arrayTreasure[i].__question = question
            arrayTreasure[i].__answer = answer
            arrayTreasure[i].__points = points 
            dataFetched = (file.readline()).strip()
        file.close()
    except FileNotFoundError:
        print("File could not be found")

readData()
print(arrayTreasure[1].getQuestion())

当我运行一个空行打印，而不是打印类型类列表中的值。
TreasureChestData.txt文件为：

需要此问题的帮助。

python-3.x

来源：https://stackoverflow.com/questions/75474077/python-class-instance-returning-the-empty-line-when-method-is-called

1条答案

按热度按时间

qojgxg4l1#

您看到的根本问题是以__开头的示例名被篡改（https：//docs.python.org/3/tutorial/classes.html#private-variables），这正是您使用该约定所要求的。
因此，要访问它们，您需要执行以下操作：

arrayTreasure[i]._treasureChest__question = question

以便实际设置该值。
例如：

x = treasureChest("", bool(), 0)
print(x.getQuestion())

x.__question = "q"
print(x.getQuestion())

x._treasureChest__question = "q"
print(x.getQuestion())

不过，我建议您看一看这段代码，看看它是否有助于导入您的宝藏数据。

class TreasureChest:
    def __init__(self,questionP, answerP, pointsP):
        self.__question = questionP
        self.__answer = answerP
        self.__points = pointsP

    def getQuestion(self):
        return self.__question
    
    def checkAnswer(self, answer):
        return self.__answer == answer

    def getPoints(self, attempt):
        if attempt == 1:
            return self.__points
        elif attempt == 2:
            return self.__points // 2
        elif attempt == 3 or attempt == 4:
            return self.__points // 4
        else:
            return 0

def get_treasure_chests(treasure_file_name):
    treasure_chests = []
    with open(treasure_file_name) as file_in:
        for question in file_in:
            treasure_chests.append(TreasureChest(
                question.strip(),
                file_in.readline().strip(),
                file_in.readline().strip()
            ))
    return treasure_chests

treasure_chests = get_treasure_chests("TreasureChestData.txt")

for treasure_chest in treasure_chests:
    print(treasure_chest.getQuestion())

这就给了我：

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调用方法时返回空行的Python类示例

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