在 Python 2.7 中应用折扣并显示折扣率答案

【问题标题】：Applying a discount and showing discounted rate in Python 2.7在 Python 2.7 中应用折扣并显示折扣率
【发布时间】：2015-03-05 05:18:44
【问题描述】：

我有一个简短的问题要问大家。我目前正在开发一个示例航空公司预订系统，如果用户是常旅客（10% 的折扣率），我很难显示折扣总额。以下是我的代码：

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。

任何帮助将不胜感激！谢谢！

【问题讨论】：

标签： python rate discount

【解决方案1】：

你有不止一个错误。首先，在第一个 if 的 else 中，您不计算 seat_total，因此以下计算将崩溃 - 您只需这样做

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

（括号是无用的，但它们没有伤害，所以我让它们成为：-)。

其次，看看你的折扣逻辑：

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

您是在非常明确表示，用户支付了标价的 1/10 的折扣 - 然后您在 Q 中抱怨它！-)

再一次，很明显（对于阅读字里行间的人来说——当然永远不会对计算机来说：-），这与你说，你实际上的意思形成鲜明对比 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

【讨论】：