Python从父类继承变量 [英] Python inherit variables from parent class

问题描述

对不起，如果我不能很好地解释它，但我会尽力而为：

Sorry if I don't explain it that well but I'll try my best:

所以我想从Parent类继承变量，但是我在创建Child类的实例时，不想再次传递它们，因为我认为这是多余的。我只想使用例如Parent的眼睛颜色。请参阅下面的示例代码了解我的意思

So I want to inherit the variables from the Parent class, but I don't want to pass them again when creating an instance of the Child class because I think that is redundant. I just want to use the eye color from the Parent for example. See the example code below for what I mean

这是有效的方法：

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

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)

推荐答案

您可以尝试将 Parent 实例传递给 Child 初始值设定项...可能是最接近的。

You could try passing a Parent instance to the Child initializer...That's probably the closest you'll get.

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按住 last_parent 变量：

Another thing you could do is hold a last_parent variable:

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)

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