Operators through dunder methods in Python
Python interview exercise on Classes & Dataclasses, difficulty 2 of 3. Solve it in the editor beside a worked example, or cold in Interview mode with the example hidden; the tests run the moment you do.
Write Vector(x, y) supporting v + w, v * number, v == w, abs(v) (its length) and a repr like "Vector(1, 2)". Each operator is a method with a fixed double-underscore name.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.