Can anyone answer me this question in Python? Thx

Question

Why the first one no need “Vector2D” in return but the second need ? Thanks

class Vector2D:
def __init__(self, x):
self.x = x

def __truediv__(self, other):
return self.x + other.x

first = Vector2D(5)
second = Vector2D(3)
print(first/second)

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

Because the first returns only a number. 5 + 3 - > 8
But the second one returns a new object of Vector2D. So result becomes an object of Vector2D, not only a "simple" number.

Answer 2

I don't know why you are adding member <x> from two objects <self> and <others> in the __truediv__ magic method. It's supposed to return a floating point division result.

You can return a Vector2D object from the __truediv__ magic if you choose so though ...