Please clarify the oop statement and use of __init__?

Question

Class A:
def __init__ (self):
self.a=0
def change(self,n):
a=n
obj=A()
obj.change(2)
print(obj.a)

Answer 1

init is basically loading up a class instance with default (or not) values

Answer 2

The __init__ function from the name itself you can see that it initializes the instance variables of a class.

In __init__(self): here self is nothing but a reference to the current instance.

When you say, obj = A() you are by default passing the instance 'obj' to the function. It is equivalent to obj = A(obj).

So self.a is associated to an instance but the one in change() is not. It is a new variable. So when you say print(obj.a) it returns the one which is associated with the current instance 'obj'.

You can do self.a = n in the change() to get the output as 2.