Error _add_ Vector3D

Question

Hello community
I don't understand why this code doesn't work
someone help

class Vector3D:
def __init__(self, x, y, z):
self.x = x
self.y = y
self.z = z
def __add__(self, other, another):
return Vector3D(self.x + other.x + another.x, self.y + other.y + another.y, self.z + other.z + another.z)

first = Vector3D(5, 7, 2)
second = Vector3D(3, 9, 3)
third = Vector3D(5, 6, 4)
result = first + second + third
print('x=', result.x)
print('y=', result.y)
print('z=', result.z)

Answer 1

__add__
is a methode you only can override.
delete another and everything will work as expected, because the + calls the __add__ methods each time!
or let me rephrase it, first two vectors will added together, and the result with the third one.

does this help?