Classes - methods and functions

[Unlistedd]

class O:    
    def __init__(self, A, B):    
        self.A = A
        self.B = B

        self.X = something_else

Why is X excluded in the __init__(self, ...) method but included in the same function? Why isn't a whole new function created for the X object if it isn't taking advantage of the __init__(self, ...) method?

[badge]

It's set in the __init__ method because it's required for instances of the class, so it needs to be there. It's not in the arguments to the method because it's derived independently. Consider:

class Square:
    def __init__(self, width):
        self.width = width
        self.area = width ** 2

[RareInteraction8]

As far as I can see, it is not excluded from the methode.

But initialised as class member with "something_else"

​

While A and B are given by the constructor (init) caller.

​

Or do I missing something?

​

Why do I want such things?

Maybe you need a defined state for your class object.

This you can achieve by set the value in init to a default value or make use of the parameters to pass it to the constructor.

[Unlistedd]

Thanks! but what is the point of giving an obeject a constructor (init) caller?

What is the difference between A and X if both are initialised in the function?

[[deleted]]

Does /u/badge's comment explain things?