Write a memoize decorator in Python
Python interview exercise on Functions & Decorators, difficulty 3 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 memoize(fn), a decorator that caches results by positional arguments so fn runs once per distinct argument tuple. Keep the wrapped function's name with functools.wraps. The standard library has this as functools.cache; write it yourself here.
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.