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

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):
    def changeColor(self):
        self.pen_color = 'green'

>Solution :

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.

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