Question

我设置了以下两个类：

class Player:

    POINTS_PER_PASSING_YARD = 0.04
    POINTS_PER_PASSING_TOUCHDOWN = 4
    POINTS_PER_INTERCEPTION = -1
    POINTS_PER_RUSHING_YARD = 0.1
    POINTS_PER_RUSHING_TOUCHDOWN = 6
    POINTS_PER_RUSHING_FUMBLE = -2
    POINTS_PER_RECEPTION_YARD = 0.1
    POINTS_PER_RECEPTION_TOUCHDOWN = 6

def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles):
    self.name = name
    self.team = team
    self.rushingYards = rushingYards
    self.rushingTouchdowns = rushingTouchdowns
    self.rushingFumbles= rushingFumbles

def calculatePoints(self):
    return self.rushingYards * POINTS_PER_RUSHING_YARD + self.rushingTouchdowns * POINTS_PER_RUSHING_TOUCHDOWN + self.rushingFumbles * POINTS_PER_RUSHING_FUMBLE

def toString(self):
    return "name: " + self.name + " team: " + self.team + " passing yards: " + self.passingYards + " rushing yards: " + self.rushingYards + " touchdowns: " + self.touchdowns + " interceptions: " +     self.interceptions

然后我有一个继承自Player的QB类：

来自玩家导入*

class QB(Player):
    def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles, passingYards, passingTouchdowns, interceptions, position="QB"):
        super().__init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles)
        self.passingYards = passingYards
        self.passingTouchdowns = passingTouchdowns
        self.interceptions = interceptions

    def toString(self):
        return "position: " + self.position + super().toString()

然后在我的主要课程中，我只是这样做：

myQB = QB("Brees", "Saints", 0, 0, 0, 4952, 33, 17)
print(myQB)

我收到以下错误：

Traceback (most recent call last):
  File "main.py", line 35, in <module>
    main()
  File "main.py", line 32, in main
    myQB = QB("Brees", "Saints", 0, 0, 0, 4952, 33, 17)
  File "/Users/benjaminclayman/Desktop/Aurora_Fantasy_Football/QB.py", line 5, in __init__
    Player.__init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles)
TypeError: object.__init__() takes no parameters

但是我不知道为什么，因为我写的所有init方法做都带参数......

知道出了什么问题吗？

谢谢， bclayman

Answer 1

如果你在第一个脚本（Player类）中的缩进是正确的，那就是问题。

根据您的缩进，__init__()方法和其他方法不属于课程Player，因此Player使用object课程＆＃39; __init__()，它不接受任何参数（self除外），但我们不需要明确传递它。

您可能希望修复缩进，以便所有实例方法（您打算在Player类中）都进入Player类。

示例 -

class Player:

    POINTS_PER_PASSING_YARD = 0.04
    POINTS_PER_PASSING_TOUCHDOWN = 4
    POINTS_PER_INTERCEPTION = -1
    POINTS_PER_RUSHING_YARD = 0.1
    POINTS_PER_RUSHING_TOUCHDOWN = 6
    POINTS_PER_RUSHING_FUMBLE = -2
    POINTS_PER_RECEPTION_YARD = 0.1
    POINTS_PER_RECEPTION_TOUCHDOWN = 6

    def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles):
        self.name = name
        self.team = team
        self.rushingYards = rushingYards
        self.rushingTouchdowns = rushingTouchdowns
        self.rushingFumbles= rushingFumbles

您需要为Player类中的所有方法执行此操作。

还有一个问题，您不应将self传递给使用__init__()调用的te super()方法。

示例 -

class QB(Player):
    def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles, passingYards, passingTouchdowns, interceptions, position="QB"):
        super().__init__(name, team, rushingYards, rushingTouchdowns, rushingFumbles)

Answer 2

很少有问题，首先你需要修复缩进。

第二，你应该改变

 this class Player:

要

 class Player(object):

另一个问题是，当您调用静态成员时，这是处理它们的方法：

Player.POINTS_PER_RUSHING_YARD  # name of the class and then the static member.

这就是你的超级应该是这样的：

super(QB, self).__init__(name, team, rushingYards, rushingTouchdowns, rushingFumbles)

这是代码：

    class Player(object):
    POINTS_PER_PASSING_YARD = 0.04
    POINTS_PER_PASSING_TOUCHDOWN = 4
    POINTS_PER_INTERCEPTION = -1
    POINTS_PER_RUSHING_YARD = 0.1
    POINTS_PER_RUSHING_TOUCHDOWN = 6
    POINTS_PER_RUSHING_FUMBLE = -2
    POINTS_PER_RECEPTION_YARD = 0.1
    POINTS_PER_RECEPTION_TOUCHDOWN = 6
    def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles):
        self.name = name
        self.team = team
        self.rushingYards = rushingYards
        self.rushingTouchdowns = rushingTouchdowns
        self.rushingFumbles= rushingFumbles
    def calculatePoints(self):
        return self.rushingYards * Player.POINTS_PER_RUSHING_YARD + self.rushingTouchdowns * Player.POINTS_PER_RUSHING_TOUCHDOWN + self.rushingFumbles * Player.POINTS_PER_RUSHING_FUMBLE
    def toString(self):
        return "name: " + self.name + " team: " + self.team + " passing yards: " + self.passingYards + " rushing yards: " + self.rushingYards + " touchdowns: " + self.touchdowns + " interceptions: " +     self.interceptions


class QB(Player):
    def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles, passingYards, passingTouchdowns, interceptions, position="QB"):
        super(QB, self).__init__(name, team, rushingYards, rushingTouchdowns, rushingFumbles)
        self.passingYards = passingYards
        self.passingTouchdowns = passingTouchdowns
        self.interceptions = interceptions

    def toString(self):
       return "position: " + self.position + super(Player).toString()


myQB = QB("Brees", "Saints", 0, 0, 0, 4952, 33, 17)
print(myQB)

Answer 3

在Python中，缩进起主要作用。问题清单： 1）__init__()应该在Player类中。否则您的初始化将无效。

2）其他函数def calculatePoints(self）也应该在class Player范围内。目前在您的代码中，它是在类外定义的。

3）def toString(self)也应在class Player范围内。

3.1) Also the concatenation of string and int is not permitted. 
3.2) The variable `self.touchdowns` is not initialized in the def toString of class Player.
3.3) The alternate way to print the class with significant information 
     about class can be written in this manner.

class Player:
    POINTS_PER_PASSING_YARD = 0.04
    POINTS_PER_PASSING_TOUCHDOWN = 4
    POINTS_PER_INTERCEPTION = -1
    POINTS_PER_RUSHING_YARD = 0.1
    POINTS_PER_RUSHING_TOUCHDOWN = 6
    POINTS_PER_RUSHING_FUMBLE = -2
    POINTS_PER_RECEPTION_YARD = 0.1
    POINTS_PER_RECEPTION_TOUCHDOWN = 6

    def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles):
        self.name = name
        self.team = team
        self.rushingYards = rushingYards
        self.rushingTouchdowns = rushingTouchdowns
        self.rushingFumbles= rushingFumbles

    def calculatePoints(self):
        return self.rushingYards * POINTS_PER_RUSHING_YARD + self.rushingTouchdowns * POINTS_PER_RUSHING_TOUCHDOWN + self.rushingFumbles * POINTS_PER_RUSHING_FUMBLE

    def __str__(self):
        return "name: %s team: %s passing yards: %r rushing yards: %r rushingTouchdowns: %r interceptions: %r"  % (self.name, self.team, self.passingYards, self.rushingYards, self.rushingTouchdowns ,self.interceptions)

4）self.position = position需要在class QB初始化，如下所示：

class QB(Player):
    def __init__(self, name, team, rushingYards, rushingTouchdowns, rushingFumbles, passingYards, passingTouchdowns, interceptions, position="QB"):
        super().__init__(name, team, rushingYards, rushingTouchdowns, rushingFumbles)
        self.passingYards = passingYards
        self.passingTouchdowns = passingTouchdowns
        self.interceptions = interceptions
        self.position = position

    def __str__(self):
        return "position: " + self.position + super().__str__()

基本的Python继承问题

3 个答案: