同样的问题：

Question

我正在尝试使用codeacdemy学习python。这是他们的练习之一。基本上他们让我创建了4个不同的函数来计算总成本。但是没有选项要求用户手动输入值。这就是我想要的。代码直到return rental-car_cost部分。它只是我遇到麻烦的最后一点。

print "this code calculates the total price of a trip, using 4 functions"

def hotel_cost(nights):
    return 140*nights

def plane_ride_cost(city):
    if (city=="Charlotte"):
        return 183

    elif(city=="Tampa"):
        return 220

    elif(city=="Pittsburgh"):
        return 222

    elif(city=="Los Angeles"):
        return 475

def rental_car_cost(days):
    cost=days*40

    if (days>=7):
        cost -= 50

    elif(days>=3):
        cost -=20

    return cost

def trip_cost(city,days,spending_money):
    return rental_car_cost(days)+hotel_cost(days)+ plane_ride_cost(city)+spending_money

city= raw_input("enter city name")
days= raw_input("enter number of days staying")
spending_money= raw_input("enter spendig money")
print trip_cost(city,days, spending_money)

这是原始代码，它完全没问题。我想要做的就是让用户在运行代码时输入值。

def hotel_cost(nights):
    return 140*nights

def plane_ride_cost(city):
    if (city=="Charlotte"):
        return 183

    elif(city=="Tampa"):
        return 220

    elif(city=="Pittsburgh"):
        return 222

    elif(city=="Los Angeles"):
        return 475

def rental_car_cost(days):
    cost=days*40

    if (days>=7):
        cost -= 50

    elif(days>=3):
        cost -=20

      return cost

def trip_cost(city,days,spending_money):
    return rental_car_cost(days)+hotel_cost(days)+ plane_ride_cost(city)+spending_money

print trip_cost("Los Angeles",5,600)

Answer 1

同样的问题：

Vacation price program Python

提出

仅考虑一下改进此代码。我想是的，它没有回答你的问题。

我不知道Code Academy对于该练习的建议是什么，但在某种程度上更容易和更清洁：

print "this code calculates the total price of a trip, using 4 functions"

def hotel_cost(nights):
    return 140 * nights

def plane_ride_cost(city):
    #So you can create dict and put for each city
    #Key - name of city
    #value - cost
    CITY_COST = {
        "Charlotte": 183,
        "Pittsburgh" : 222,
        "Los Angeles" : 475,
        "Tampa": "220"
    }
    #Method from dict 
    #if city doesn't exists it'll return False
    #The second param is default return if doesn't exist key into dict
    #you can change if do you want
    return CITY_COST.get(city, False)



def rental_car_cost(days):

    cost = days * 40

    if (days >= 7):
        cost -= 50

    elif(days >=3 ):
        cost -=20

    return cost

def trip_cost(city,days,spending_money):
    return rental_car_cost(days)+hotel_cost(days)+ plane_ride_cost(city)+spending_money

city= raw_input("enter city name")
days= raw_input("enter number of days staying")
spending_money= raw_input("enter spendig money")
print trip_cost(city,days, spending_money)

有关Dict

的文档

https://docs.python.org/2/tutorial/datastructures.html#dictionaries

Answer 2

尝试使用int(raw_input(enter number of days staying"))或input("enter number of days staying")代替raw_input("enter number of days staying")会发生什么？你看到有什么区别吗？这是因为raw_input()将输入数据转换为字符串，但它与input()不同。找出input()和raw_input（）之间的差异以及它随着python的发展而变化的方式。我对代码进行了一些更改，如下所示。它运行完美，没有错误。如果它对你有所帮助，请告诉我。

print "this code calculates the total price of a trip, using 4 functions"

def hotel_cost(nights):
    return 140*nights

def plane_ride_cost(city):
    if (city=="Charlotte"):
        return 183

    elif(city=="Tampa"):
        return 220

    elif(city=="Pittsburgh"):
        return 222

    elif(city=="Los Angeles"):
        return 475

def rental_car_cost(days):
    cost=days*40

    if (days>=7):
        cost -= 50

    elif(days>=3):
        cost -=20

    return cost

def trip_cost(city,days,spending_money):
    return rental_car_cost(days)+hotel_cost(days)+ plane_ride_cost(city)+spending_money

city= raw_input("enter city name")
days= int(raw_input("enter number of days staying"))  ##### notice here
spending_money= int(raw_input("enter spendig money")) ### and here too
print trip_cost(city,days, spending_money)

除了上述内容，您还可以使用以下代码。

################## without type casting#############
    city= raw_input("enter city name")
    days= input("enter number of days staying")  ##### notice something here
    spending_money= input("enter spendig money") ### and here 
    print trip_cost(city,days, spending_money)

获取用户输入的功能

2 个答案:

同样的问题：

提出

有关Dict