带有输入函数和多个条件检查的Python循环

Question

我正在解决以下问题，并遇到无法正确定义决策运算符或while循环的情况。

任务：

客户每月的折扣取决于他们签下的合同的期限，如下所示：

3-6个月2%折扣

7-12个月5%折扣

12个月以上10%折扣

这个程序应该询问用户他们的名字和他们的游戏包的每月费用。然后它应该要求他们输入他们想要的合同长度。最长合同期限为18个月。该程序应最终显示输入的详细信息和最终的包装成本与折扣申请。

contract_length = 0
final_cost = 0

#prompt the user to enter their name
user_name = input("What is your name? ")

#prompt the user to enter monthly cost for the game package
package_cost = float(input("Monthly cost of your game package: "))

while contract_length > 0 and contract_length <= 18:

    #prompt the user to enter the contract length
    contract_length = int(input("Enter the contract length you would like: "))


    #selection statement to calculate final cost
    if contract_length > 12: 
        discount = (package_cost * 0.1)
        final_cost = format(package_cost - discount,".2f")

    elif contract_length > 6:
        discount = (package_cost * 0.05)
        final_cost = format(package_cost - discount, ".2f")

    elif contract_length >= 3:
        discount = (package_cost * 0.02)
        final_cost = format(package_cost - discount, ".2f")
    else:
        print("Invalid entry")


#display results
print("Name " +user_name)
print("Package Cost £",str(package_cost))
print("Months in Contract " , str(contract_length))
print("The final cost is £",str(final_cost))

错误我有

What is your name? Jhon
Monthly cost of your game package: 35.12
Name Jhon
Package Cost £ 35.12
Months in Contract  0
The final cost is £ 0
>>> 

我甚至尝试了“和”to“或”，但是对于或操作符，它开始在while循环下重复输入函数。有什么帮助吗？谢谢。

Answer 1

我建议您在final_cost上设置一个条件，如：

contract_length = 0
final_cost = 'none'

#...

while final_cost == 'none':

    #prompt the user to enter the contract length
    contract_length = int(input("Enter the contract length you would like: "))

    if contract_length > 18:
        print("Invalid entry")
        continue

    #selection statement to calculate final cost
    if contract_length > 12: 
        discount = (package_cost * 0.1)
        final_cost = format(package_cost - discount,".2f")

    elif contract_length > 6:
        discount = (package_cost * 0.05)
        final_cost = format(package_cost - discount, ".2f")

    elif contract_length >= 3:
        discount = (package_cost * 0.02)
        final_cost = format(package_cost - discount, ".2f")

    else:
        print("Invalid entry")

Answer 2

以下是另一个解决方案：

contract_length = 0
final_cost = 0
package_cost = 0
user_name = None

while not user_name:
    user_name = input("What is your name? ")

while package_cost <= 0:
    package_cost = input("Monthly cost of your game package: ")
    if not package_cost.isdigit():
        package_cost = 0
    package_cost = float(package_cost)

while not (3 <= contract_length <= 18):
    contract_length = input("Enter the contract length you would like: ")
    if not contract_length.isdigit():
        contract_length = 0
    contract_length = int(contract_length)

if contract_length > 12:
    discount = 0.1
elif contract_length > 6:
    discount = 0.05
elif contract_length >= 3:
    discount = 0.02
else:
    discount = 0

final_cost = package_cost - (package_cost * discount)

print("Name", user_name)
print("Package Cost £", format(package_cost, ".2f"))
print("Months in Contract", contract_length)
print("The final cost is £", format(final_cost, ".2f"))