how can I change the attribute value in supercalass from subclass permanently in python

Question

I want to change the value of attribute pen_color in View class permanently when I call changeColor method and the value still permenant unless I call the method again with another color,
when I call changeColor method the pen_color attribute still have the same value and I don’t want such thing
Is there any way to do such thing or not ?

class View: 
    def __init__(self):
        self.pen_color = 'red'
    

class Button(View): 
    def __init__(self):
        pass
        
    def changeColor(self):
        super().__init__()
        
        self.pen_color = 'green'

Asked By: Abdallah Eldesouky

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Source

Answer 1

You should move the declaration of pen color into a class attribute rather than an instance attribute and reference it as View.pen_color.

Having done that View.pen_color will be permanent and global, but can be shadowed by self.pen_color in either View or Button instances.

Answered By: brunson

Answer 2

This is not best practice, but if you really want then you can do it. To do this is to make a function to set the initial color in the superclass’ __init__(), then change that function later on. Here’s an example:

class View:
    def __init__(self):
        self.initColor()

    def initColor(self):
        self.pen_color = 'red'


class Button(View):
    def __init__(self):
        super().__init__()

    def changeColor(self, color):
        def newColor(self):
            self.pen_color = color
        View.initColor = newColor


btn = Button()
print(btn.pen_color) # returns 'red'
btn.changeColor('green')

btn2 = Button()
print(btn2.pen_color) # returns 'green'

Answered By: Michael M.

how can I change the attribute value in supercalass from subclass permanently in python

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