编程新手，不明白为什么我无法打印此变量

debugcn 发表于 Dev

塞恩（H. Seigne）

每当我运行此代码时，它就会告诉我在第19行上的distanceTravelled没有定义，但是我认为我在函数中定义了它。谢谢你的帮助。

startKilometre = float(input("What is the starting kilometre?"))
finalKilometre = float(input("What is the final kilomotre"))
finalFuel = float(input("How much fuel did you put in the car?"))

def functionTravelled(startKilometre, finalKilometre):
    distanceTravelled = finalKilometre - startKilometre
    return distanceTravelled



def functionLitresKilo(distanceTravelled, finalFuel):
    litresPerKilometre = distanceTravelled / finalFuel
    return litresPerKilometre

def functionKiloLitres(finalFuel, distanceTravelled):
    kilometresPerLitre = finalFuel / distanceTravelled
    return kilometresPerLitre

print(distanceTravelled)
print(litersPerKilometre)
print(kilometresPerLitre)

亚历山大·克拉格斯

您永远不会调用这些函数来获取它们返回的值，因此，您的代码运行如下：

startKilometre = float(input("What is the starting kilometre?"))
finalKilometre = float(input("What is the final kilomotre"))
finalFuel = float(input("How much fuel did you put in the car?"))

print(distanceTravelled)
print(litersPerKilometre)
print(kilometresPerLitre)

当然，这不是您想要的。您需要调用每个函数并将返回结果存储在变量中：

startKilometre = float(input("What is the starting kilometre?"))
finalKilometre = float(input("What is the final kilomotre"))
finalFuel = float(input("How much fuel did you put in the car?"))

def functionTravelled(startKilometre, finalKilometre):
    distanceTravelled = finalKilometre - startKilometre
    return distanceTravelled

def functionLitresKilo(distanceTravelled, finalFuel):
    litresPerKilometre = distanceTravelled / finalFuel
    return litresPerKilometre

def functionKiloLitres(finalFuel, distanceTravelled):
    kilometresPerLitre = finalFuel / distanceTravelled
    return kilometresPerLitre

distanceTravelled = functionTravelled(startKilometre, finalKilometre)
litersPerKilometre = functionLitresKilo(distanceTravelled, finalFuel)
kilometresPerLitre = functionKiloLitres(finalFuel, distanceTravelled)

print(distanceTravelled)
print(litersPerKilometre)
print(kilometresPerLitre)

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