引入用户输入作为 def 函数参数

Question

我正在做一些基础练习，同时向 class 学习。其中一个练习使用了 def 函数，我认为他们提供的示例相当不切实际，所以我想将它们放在一起。

print("Welcome to The Car Wash Company")
print("Which service would you like to purchase?")

def wash_car(service):
    if (service == 1):
        print("Please see the selected products that will be provided to your vehicle")
        print("Wash with tri-color foam")
        print("Rinse twice")
        print("Dry with large blow dryer")
        print("Please set your vehicle to neutral and step-off the gas/break pedal at all times")

    if (service == 2):
        print("Please see the selected products that will be provided to your vehicle")
        print("Wash with white foam")
        print("Rinse once")
        print("Air dry")
        print("Please set your vehicle to neutral and step-off the gas/break pedal at all times")

    else:
        print("Sorry, We do not have the service selected at this time")
        print("Try again to choose your service from the Main Menu")

    service = input("For Premium press 1...   For Standard press 2...   ")
    if service ==1:
        print("Thank you for choosing our Premium car wash service, Please stand by.")
    if service == 2:
        print("Thank you for choosing our Standard car wash service, Please stand by.")

wash_car(service=1)

print("Thank you for choosing The Car Wash Company as your service provider!")
print("Have a wonderful rest of your day! Come again soon :)")

我遇到的问题是我不知道如何将 1/2 的用户输入定义为使用 def wash_car 函数正确执行的选择服务。另外，无论输入值如何，我的 else 语句总是触发。

谢谢，

新代码爱好者。

Answer 1

函数中所有代码按顺序运行。所以输入发生在 else 语句已经执行之后。我建议将用户输入分解为一个单独的函数，如下所示：

print("Welcome to The Car Wash Company")
print("Which service would you like to purchase?")

def wash_car(service):
    if (service == 1):
        print("Please see the selected products that will be provided to your vehicle")
        print("Wash with tri-color foam")
        print("Rinse twice")
        print("Dry with large blow dryer")
        print("Please set your vehicle to neutral and step-off the gas/break pedal at all times")

    if (service == 2):
        print("Please see the selected products that will be provided to your vehicle")
        print("Wash with white foam")
        print("Rinse once")
        print("Air dry")
        print("Please set your vehicle to neutral and step-off the gas/break pedal at all times")

    else:
        raise ValueError


def select_service():
    service = input("For Premium press 1...   For Standard press 2...   ")
    while service not in ["1","2"]:
        print("Sorry, We do not have the service selected at this time")
        print("Try again to choose your service from the Main Menu")
        service = input("For Premium press 1...   For Standard press 2...   ")
    return int(service)

service = select_service()
wash_car(service)

print("Thank you for choosing The Car Wash Company as your service provider!")
print("Have a wonderful rest of your day! Come again soon :)")

这还有在用户输入不正确时自动重试的好处。

引入用户输入作为 def 函数参数

Introduce User Input as def Function Parameter

python

syntax

function

python-3.x