[英]Python inherit variables from parent class
Sorry if I don't explain it that well but I'll try my best: 对不起,如果我不解释那么好,但我会尽我所能:
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. 所以我想从Parent类继承变量,但我不想在创建Child类的实例时再次传递它们,因为我认为这是多余的。 I just want to use the eye color from the Parent for example.
我只是想使用来自Parent的眼睛颜色。 See the example code below for what I mean
请参阅下面的示例代码,了解我的意思
This is what works: 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)
This is what I somehow want: 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)
What you ask does not make sense: 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)
In child, the parameters eye_color and length come from nowhere. 在儿童中,参数eye_color和长度来自任何地方。
rassar example is good if you want to reuse a parent object. 如果要重用父对象, rassar示例很好。
You can also do the following: 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 要么
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)
You could try passing a Parent
instance to the Child
initializer...That's probably the closest you'll get. 您可以尝试将
Parent
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)
Another thing you could do is hold a last_parent
variable: 你可以做的另一件事是持有一个
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)
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