如何找到用户输入的总和？

Question

print("Fazli's Vet Services\n")
print("Exam: 50")
print("Vaccinations: 25")
print("Trim Nails: 5")
print("Bath: 20\n")

exam = "exam"
vaccinations = "vaccinations"
trim_nails = "trim nails"
bath = "bath"
none = "none"

exam_price = 50
vaccination_price = 25
trim_nails_price = 5
bath_price = 20
none_price = 0

first_service = input("Select first service:")
second_service = input("Select second service:")

print("\nFazli's Vet Invoice")

if first_service == exam:
    print("Service 1 - Exam: " + str(exam_price))
elif first_service == vaccinations:
    print("Service 1 - Vaccinations: " + str(vaccination_price))
elif first_service == trim_nails:
    print("Service 1 - Trim Nails: " + str(trim_nails_price))
elif first_service == bath:
    print("Service 1 - Bath: " + str(bath_price))
elif first_service == none:
    print("Service 1 - None " + str(none_price))
else:
    print("Service 1 - None " + str(none_price))


if second_service == exam:
    print("Service 2 - Exam: " + str(exam_price))
elif second_service == vaccinations:
    print("Service 2 - Vaccinations: " + str(vaccination_price))
elif second_service == trim_nails:
    print("Service 2 - Trim Nails: " + str(trim_nails_price))
elif second_service == bath:
    print("Service 2 - Bath: " + str(bath_price))
elif second_service == none:
    print("Service 2 - None " + str(none_price))
else:
    print("Service 2 - None " + str(none_price))

上面是我到目前为止的代码。它打印：

Fazli's Vet Services

Exam: 50
Vaccinations: 25
Trim Nails: 5
Bath: 20

Select first service: exam
Select second service: bath

Fazli's Vet Invoice
Service 1 - Exam: 50
Service 2 - Bath: 20

我的目标是让代码将两项服务相加并得出总价。我的最终目标应该是这样的：

Chanucey's Vet Services

Exam: 45
Vaccinations: 32
Trim Nails: 8
Bath: 15

Select first service: Exam
Select second service: none

Chauncey's Vet Invoice
Service 1 - Exam: 45
Service 2 - None: 0
Total: 45

请注意代码如何添加两个价格并得出“总计”。我有什么办法可以做到这一点吗？我是一名计算机科学专业的初学者，所以我们对 Python 还不太了解。

所有代码都在 Python 中

Answer 1

使用字典 -

print("Fazli's Vet Services\n")
print("Exam: 50")
print("Vaccinations: 25")
print("Trim Nails: 5")
print("Bath: 20\n")

dictionary = {'exam':50,'vaccinations':25,'trim nails':5,'bath':20,'none':0}

first_service = input("Select first service:").lower()
second_service = input("Select second service:").lower()

print("\nFazli's Vet Invoice")

if first_service in dictionary:
    price1 = int(dictionary[first_service])
    print(f'Service 1 - {first_service.capitalize()} : {price1}')
else:
    price1 = 0
    print(f'Service 1 - None : 0')

if second_service in dictionary:
    price2 = int(dictionary[second_service])
    print(f'Service 1 - {second_service.capitalize()} : {price2}')

else:
    price2 = 0
    print(f'Service 1 - None : 0')

print('Total : ',price1+price2)