import timeit

class B:
    def __init__(self):
        self.c = 42
class A:
    def __init__(self):
        self.b = B()

def f1():
    a = A()
    return a.b.c

def f2():
    a = A()
    a = a.b
    return a.c

number = 100_000_000
for _ in range(25):
    t1 = timeit.timeit('f1()', globals=globals(), number=number)
    t2 = timeit.timeit('f2()', globals=globals(), number=number)
    print(f'{t1:.9f} {t2:.9f} ⇒ {(t2/t1-1)*100:.9f}%')