educative.io

Why self is not used with super() method? It's not mentioned in the topic

Courses
,
#1

Noticed this only after started doing quiz, don’t fully understand why self is not used with super()… Maybe it needs to be mentioned explicitly in the course :slight_smile:

#2

Hi @Dmitry_Polovinkin
We can use super with parameters. super() can take two parameters: the first is the subclass, and the second parameter is an object that is an instance of that subclass.

#3

I see, thank you! So you are talking about parameters of the super() itself? Like super(subclass, subclass_object)? :slight_smile: Great to know?
But I believe didn’t make the question specific enough - why don’t we use the self in the super()._ _ init _ _()? :slight_smile:

#4

@Dmitry_Polovinkin
for example:

class Rectangle:
    def __init__(self, length, width):
    self.length = length
    self.width = width

    def area(self):
    return self.length * self.width

    def perimeter(self):
    return 2 * self.length + 2 * self.width

class Square(Rectangle):
    def __init__(self, length):
        super(Square, self).__init__(length, length)

In Python 3, the super(Square, self) call is equivalent to the parameterless super() call. The first parameter refers to the subclass Square, while the second parameter refers to a Square object which, in this case, is self. You can call super() with other classes as well.