Question

很抱歉，如果我不能解释得那么好，但我会尽我所能：

所以我想继承Parent类中的变量，但是我不想在创建Child类的实例时再次传递它们，因为我认为这是多余的。我只是想使用来自Parent的眼睛颜色。请参阅下面的示例代码，了解我的意思

这是有效的：

class Parent:
    def __init__(self, eye_color, length):
        self.eye_color = str(eye_color)
        self.length = length


class Child(Parent):
    def __init__(self, gender, eye_color, length):
        super().__init__(eye_color, length)
        self.gender = str(gender)

x = Parent("Blue", 2)
y = Child("Men", "Blue", 2)

print(x.eye_color, x.length)
print(y.gender, x.length)

这就是我想要的：

class Parent:
    def __init__(self, eye_color, length):
        self.eye_color = str(eye_color)
        self.length = length


class Child(Parent):
    def __init__(self, gender):
        super().__init__(eye_color, length)
        self.gender = str(gender)

x = Parent("Blue", 2)
y = Child("Men")

print(x.length, x.eye_color)
print(y.gender, x.length)

Answer 1

你问的是没有意义的：

class Parent:
    def __init__(self, eye_color, length):
        self.eye_color = str(eye_color)
        self.length = length


class Child(Parent):
    def __init__(self, gender):
        super().__init__(eye_color, length)
        self.gender = str(gender)

x = Parent("Blue", 2)
y = Child("Men")

print(x.length, x.eye_color)
print(y.gender, x.length)

在儿童中，参数eye_color和长度来自任何地方。

rassar如果要重用父对象，示例很好。

您还可以执行以下操作：

class Parent:
    # def __init__(self, eye_color=(default value here), length=(default value here)):
    def __init__(self, eye_color="", length=0):
        self.eye_color = str(eye_color)
        self.length = length

OR

class Parent:
    def __init__(self, eye_color="", length=0):
        self.eye_color = str(eye_color)
        self.length = length

class Child(Parent):
    def __init__(self, gender, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.gender = str(gender)

x = Parent("Blue", 2)
y = Child("Men") # Work with first example of Parent
y = Child("Men", eye_color="Blue", length=2) # Work with first
y = Child("Men", "Blue", 2) # Work with second example

print(x.length, x.eye_color)
print(y.gender, y.length)

Answer 2

您可以尝试将Parent个实例传递给Child初始化程序...这可能是您最接近的。

class Parent:
    def __init__(self, eye_color, length):
        self.eye_color = str(eye_color)
        self.length = length


class Child(Parent):
    def __init__(self, gender, parent):
        super().__init__(parent.eye_color, parent.length)
        self.gender = str(gender)

x = Parent("Blue", 2)
y = Child("Men", x)

print(x.length, x.eye_color)
print(y.gender, x.length)

您可以做的另一件事是持有last_parent变量：

global last_parent

class Parent:
        def __init__(self, eye_color, length):
            self.eye_color = str(eye_color)
            self.length = length
            last_parent = self


class Child(Parent):
    def __init__(self, gender):
        super().__init__(last_parent.eye_color, last_parent.length)
        self.gender = str(gender)

x = Parent("Blue", 2)
y = Child("Men")

print(x.length, x.eye_color)
print(y.gender, x.length)

Python从父类继承变量

2 个答案: