def parhuzamos_ellenallas(xs):
    s = sum(1 / x for x in xs)
    return 1 / s if s != 0 else float('inf')

x0 = float(input(""))
x1 = float(input(""))
print(parhuzamos_ellenallas([x0, x1]))
            
        

Output:

def parhuzamos_ellenallas(xs): s = sum(1 / x for x in xs) return 1 / s if s != 0 else float('inf') x0 = float(input("")) x1 = float(input("")) print(parhuzamos_ellenallas([x0, x1]))