Question

我正在尝试创建一个将英制转换为公制的程序。我遇到麻烦的部分是，任何输入是无效数字（任何负数）我应该终止程序而不使用退出，中断或系统退出。

print('Hello, Please input the Imperial values!')
#Miles
Miles = float(input('Miles to Kilometers: '))
totalKilometers = (1.6 * Miles)
if Miles < 0:
 print('Please no negative numbers')
else:
 if Miles > 0:
    print("The metric conversion is ", totalKilometers)
#Fahrenheit
Fahrenheit = float(input('Fahrenheit to Celsius: '))
totalCelcius = ((Fahrenheit - 32) * 5/9 )
if Fahrenheit < 0 or Fahrenheit > 1000:
print('Please check your Fahrenheit number, It must be greater than 0 and
less than 1000')
else:
 if Fahrenheit > 0 or Fahrenheit < 1000:
   print("The metric conversion is ", totalCelcius)
#Gallons
Gallons = float(input('Gallons to Liters: '))
totalLiters = (3.9 * Gallons)
 if Gallons < 0:
print('Please no negative numbers')
else:
 if Gallons > 0:
    print("The metric conversion is ", totalLiters)
#Pounds
Pounds = float(input('Pounds to Kilograms: '))
totalKilograms = (.45 * Pounds)
if Pounds < 0:
print('Please no negative numbers')
else:
 if Pounds > 0:
  print("The metric conversion is ", totalKilograms)
#Inches
Inches = float(input('Inches to Cenitmeters: '))
totalCentimeters = (2.54 * Inches)
 if Inches < 0:
print('Please no negative numbers')
else:
 if Inches > 0:
    print("The metric conversion is ", totalCentimeters)

Answer 1

由于您不能退出程序，因此请将所有已经具有的代码定义为一个函数，然后使用return。代码看起来像这样：

def imp-met():
    print('Hello, Please input the Imperial values!')
    #Miles
    Miles = float(input('Miles to Kilometers: '))
    totalKilometers = (1.6 * Miles)
    if Miles < 0:
        print('Please no negative numbers')
        return
    (rest of code using return when needed)
imp-met()

如何在收到无效输入后退出程序？

1 个答案: