Python Forum

Is it possible to use more than 2 parameters for magic methods/Dunders for arithmetic operators? The following is my code

class Point():
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __str__(self):
        return f"Point ({self.x}, {self.y})"

    def __add__(self, other):
        return Point(self.x+other.x, self.y+other.y)

point = Point(1, 2)

other = Point(3, 5)
print(point+other)

I want to get something like

def __add__(self, other, something_else):
        return Point(self.x+other.x+something_else.x, self.y+other.y+something_else.y)

Also, for some reason the indentations dont show, so please ignore that :)

ClownPrinceOfCrime Wrote:for some reason the indentations dont show, so please ignore that

We will certainly not ignore that. Instead, you will read the BBCode help page to learn how to make the indentation show.

About the issue, how would you invoke your extended __add__ operator? If you write

obj + other + something_else

in the code, it will call

obj.__add__(other).__add__(something_else)

and not

obj.__add__(other, something_else)

the familiar arithmetic operations of addition, subtraction, multiplication, etc. are binary operation

If say you had a load of points in a collection that you wanted to add up, that could neatly be done with reduce.