Why this code of method overloading not working? The only addition I made was one more to original one as described in dunders

Question

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

first = Vector2D(5, 7)
second = Vector2D(3, 9)
third = Vector2D(2, 4)
result = first + second + third
print(result.x)
print(result.y)

Answer 1

This code will give you a type error.

when you write:
a + b + c

python implicitly calls:
a.__add__(b.__add__(c))

so the third parameter (one more) never gets passed to your overloaded __add__ method.

the reason for this is + is a binary operator, Bi meaning 2. it only works on two operands. therefore it only takes two parameters: self and other

to make your code work you'd have to do:
a.__add__(b, c) which defeats the purpose of the + operator

Answer 2

thanx a lot that's why I have seen loads of examples on net where there are self and other ie. 2 args and not 3