Help me plz !! Magic Methods (dunders)

Question

help me understand the logic of this code :
my problem is that:

1. when we call Vector2D for the second time, what will happen to the first one ?? does the program store it somewhere ???
and

2. where we defined that + in this line
result = first + second
would give us the sum of the elements ??

3.why we cannot do it with the regular methods ??

4.why in this line
def __add__(self, other):
other is operating just like self but in __init__ the other values will use as unknowns !!

CODE:

class Vector2D:
def __init__(self, x, y):
self.x = x
self.y = y
def __add__(self, other):
return Vector2D(self.x + other.x, self.y + other.y)

first = Vector2D(5, 7)
second = Vector2D(3, 9)
result = first + second
print(result.x)
print(result.y)

Answer 1

a lot of questions in one thread.
1. lines first = .., second = ... creates two separate objects of the class. see class as template orj pattern, and object like a real good produced using template.
2. when code contains + , interpreter calls method __add__(), so the function def __add__() creates the rule (to be correct override) for the operator +, which basically adds two objects of the same class. (note, in python everything is an object!!!!!!!)
3. what do you mean by regular method? every class has its own methods. 1+2 and "1"+" 2" seems similar, but + is used from the different classes and the method is different. again, in python everything is an object.
4. I guess it is answered above. self and other are representatives of the same class(created by the same template). and the method works assuming they are from the same class.

Answer 2

1. When we call Vector2D for the second time it doesn't change anything about the first time. And the program then stores both under different variables.

2. result = first + second... It bassicaly makes two results - result of x number in function and result of y number in function.
So when we call print(result.x) it prints result of x and when we call print(result.y) it prints result of y.

3. It's easier that way, I think so.