业余爱好者:为什么我不能给这个字符串/变量一个硬币的值？

Question

# Vending Machine Simulation

print ("Welcome to the vending machine simulation")

print ("Please enter three coins. Enter as 10 (10p), 20 (20p), 50 (50p) or 100 (£1)")

c1 = int(input("Please enter your first coin: "))
while c1 not in (10, 20, 50, 100):
    print("That is not an accepted coin value")
    c1 = int(input("Please re-enter your first coin: "))

c2 = int(input("Please enter your second coin: "))
while c2 not in (10, 20, 50, 100):
    print("That is not an accepted coin value")
    c2 = int(input("Please re-enter your second coin: "))

c3 = int(input("Please enter your third coin: "))
while c3 not in (10, 20, 50, 100):
    print("That is not an accepted coin value")
    c3 = int(input("Please re-enter your third coin: "))

total = int(c1 + c2 + c3)
print ("You have",total," in credit.")

print ("Thank you for entering your coins. Prices: Hydration: £1, Nutrition: 60p")

Hydration = ("Cola","Fanta","Coffee")
Nutrition = ("Bacon", "Steak","Beans")

print ("Hydration Menu:")
print (Hydration)
print ("Nutrition Menu:")
print (Nutrition)

cost =[]
cost[Hydration] = 100
cost[Nutrition] = 60

pro1 = input ("What would you like, sir/madam?: ")

while pro1 not in (Hydration, Nutrition):
    print (total)
    pro1 = input ("You entered an invalid term. What would you like, sir/madam?: ")

while cost[pro1] > total:
    print ("You do not have enough credit to purchase this product.")
    pro1 = input ("What would you like, sir/madam?: ")
if cost[pro1] < total:
    total = total - cost[pro1]
    print ("Thank you.",total)

pro2 = input ("Would you like anything else, sir/madam?: ")

while pro2 not in (Hydration, Nutrition):
    print (total)
    pro2 = input ("You entered an invalid term. What would you like, sir/madam?: ")

while cost[pro2] > total:
    print ("You do not have enough credit to purchase this product.")
    pro2 = input ("Would you like anything else, sir/madam?: ")
if cost[pro2] < total:
    total = total - cost[pro2]
    print ("Thank you.",total)

pro3 = input ("You have quite the appetite. Would you like anything else, sir/madam?: ")

while pro3 not in (Hydration, Nutrition):
    print (total)
    pro3 = input ("You entered an invalid term. What would you like, sir/madam?: ")

while cost[pro3] > total:
    print ("You do not have enough credit to purchase this product.")
    pro3 = input ("Would you like anything else, sir/madam?: ")
if cost[pro3] < total:
    total = total - cost[pro3]
    print ("Thank you.",total)

我已经上传了我的全部代码，因为我猜我遗漏了一些你需要知道的部分。

我本打算把我遇到问题的部分用粗体表示出来，但这行不通。所以,

Hydration = ("Cola","Fanta","Coffee")
Nutrition = ("Bacon", "Steak","Beans")

print ("Hydration Menu:")
print (Hydration)
print ("Nutrition Menu:")
print (Nutrition)

cost =[]
cost[Hydration] = 100
cost[Nutrition] = 60

我正在尝试将变量Nutrition和Hydration赋值为60和100，这样程序就会知道从您的信用中减去多少，但它总是返回变量‘成本’没有定义。此外，代码似乎没有认识到产品(如上所示)是有效术语，尽管它们应该与变量Hydration和Nutrition相关联。

正如你所看到的，我对代码的艺术并不是很了解。这就是我需要帮助的原因。提前谢谢你。

Answer 1

你需要一本字典，而不是一份清单

cost ={}
cost["Hydration"] = 100
cost["Nutrition"] = 60
print cost["Nutrition"]

或者，您可能想要将成本与水合作用列表的每个成员相关联

costs_hydration = [100,100,100]
costs_nutrition = [60,60,60]
costs = {}
costs.update(dict(zip(Hydration,costs_hydration)))
costs.update(dict(zip(Nutrition,costs_nutrition)))
print costs["Beans"]