在 Python 2.7 中应用折扣并显示折扣率

Question

我有一个简短的问题要问大家。我目前正在开发一个样本航空公司预订系统，如果用户是飞行常客（10% 的折扣率），我在显示折扣总额时遇到困难。下面是我的代码：

user_people = int(raw_input("Welcome to Ramirez Airlines!  How many people will be flying?"))
user_seating = str(raw_input("Perfect!  Now what type of seating would your party prefer?"))
user_luggage = int(raw_input("Thanks.  Now for your luggage, how many bags would you like to check in?"))
user_frequent = str(raw_input("Got it.  Is anyone in your party a frequent flyer with us?"))
user_continue = str(raw_input("Your reservation was submitted successfully.  Would you like to do another?"))
luggage_total = user_luggage * 50


import time
print time.strftime("Date and time confirmation: %Y-%m-%d %H:%M:%S")

seats_total = 0

if user_seating == 'economy':
    seats_total = user_people * 916
    print ('The total amount for your seats is: $'),seats_total

elif user_seating == 'business':
    seats_total = user_people * 2650
    print ('The total amount for your seats is: $'),seats_total

else: 
    print ('The total amount for your seats is: $'),user_people * 5180

print ('The total amount of your luggage is: $'),luggage_total

print ('Your subtotal for your seats and luggage is $'), luggage_total + seats_total

discount_amount = 0
discount_rate = 0.10

if user_frequent == 'yes':
    before_discount = luggage_total + seats_total
    after_discount = before_discount * discount_rate
    discount_amount = before_discount - after_discount
    print discount_amount

else:
    print ('Sorry, the discount only applies to frequent flyers!')

虽然我没有收到错误，但我的输出不正确。这是正在显示的内容：

Discount amount of 1738.8

这显然是不正确的，因为这是折扣后的价格。我正在尝试显示总折扣以及应用折扣后的价格。

如有任何帮助，我们将不胜感激！谢谢！

Answer 1

您的错误不止一个。首先，在第一个 if 的 else 中，你不计算 seat_total，所以后面的计算会崩溃——你只是 计算 seat_total =17=]

print ('The total amount for your seats is: $'),user_people * 5180

而不是明显需要的

seat_total = user_people * 5180 print ('The total amount for your seats is: $'), seat_total

（括号没用，但它们不会造成伤害，所以我让它们成为：-）。

其次，看你打折的逻辑：

discount_rate = 0.10 if user_frequent == 'yes': before_discount = luggage_total + seats_total after_discount = before_discount * discount_rate discount_amount = before_discount - after_discount

你明确地说非常打折后用户支付标价的 1/10 -- 然后你在 Q 中抱怨它！-)

再一次，很明显（对于阅读字里行间的人来说——当然对计算机来说永远不会:-)，这与你所说、你所说的形成鲜明对比实际上 mean 是：

discount_rate = 0.10 if user_frequent == 'yes': before_discount = luggage_total + seats_total discount_amount = before_discount * discount_rate after_discount = before_discount - discount_amount

在 Python 2.7 中应用折扣并显示折扣率

Applying a discount and showing discounted rate in Python 2.7

python

rate

discount