vector2d.py

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

    def __str__(self):
        return f"Vector2D({self.x}, {self.y})"

    def __add__(self, other):
        if isinstance(other, Vector2D):
            return Vector2D(self.x + other.x, self.y + other.y)