i dont understand how the add function is picking x of other cause i thinking it should be picking another arrtibute of first on

Question

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)

//output-8
16

Answer 1

When you do....
result = first + second
...what your actually doing is...
result = first.__add__(second)...the "second" is the "other" in the magic method.

Answer 2

+ is defined as doing what's defined in __add__, returning a new Vector with the x values and the y values added.

In this program, first will be self, second will be other.

5+3 == 8
7+9 == 16

Is it getting clearer like this?