def ms_to_kmh(v_ms): return v_ms * 3.6 def kmh_to_ms(v_kmh): return v_kmh / 3.6 print("Conversion de vitesses") print("1 : m/s -> km/h") print("2 : km/h -> m/s") choix = int(input("Ton choix : ")) if choix == 1: v = float(input("Vitesse en m/s : ")) print(v, "m/s =", ms_to_kmh(v), "km/h") elif choix == 2: v = float(input("Vitesse en km/h : ")) print(v, "km/h =", kmh_to_ms(v), "m/s") else: print("Choix invalide")