Dunder Methods

1class Vector:
2    def __init__(self, x, y):
3        self.x, self.y = x, y
4
5    def __repr__(self):
6        return f"Vector({self.x}, {self.y})"
7
8    def __str__(self):
9        return f"({self.x}, {self.y})"
10
11    def __add__(self, other):
12        return Vector(self.x + other.x, self.y + other.y)
13
14    def __eq__(self, other):
15        return self.x == other.x and self.y == other.y
16
17    def __len__(self):
18        return 2
19
20    def __getitem__(self, index):
21        return (self.x, self.y)[index]
22
23v1 = Vector(1, 2)
24v2 = Vector(3, 4)
25print(v1 + v2)   # (4, 6) - uses __add__
26print(v1 == v2)  # False - uses __eq__
27print(v1[0])     # 1 - uses __getitem__