cache.py

import time
import functools

class Foo:
    def __init__(self, n = 1):
        self.n = n

    @functools.cached_property
    def expensive(self):
        return fib(self.n)

class Mark:
    def __init__(self):
        self.time = time.perf_counter()

    def diff(self):
        return round(time.perf_counter() - self.time, 4)

@functools.lru_cache
def fact(n):
    return n * fact(n - 1) if n > 1 else n

def fib(n):
    return fib(n - 1) + fib(n - 2) if n > 1 else n

def main():
    f = Foo(35)

    a = Mark()
    print(f'a: {f.expensive} -> {a.diff()}s')

    b = Mark()
    print(f'b: {f.expensive} -> {b.diff()}s')

if __name__ == '__main__':
    main()

    # a: 9227465 -> 3.2087s
    # b: 9227465 -> 0.0s