Python学习第二天——购物车程序

程序：购物车程序

需求:

1. 启动程序后，让用户输入工资，然后打印商品列表
2. 允许用户根据商品编号购买商品
3. 用户选择商品后，检测余额是否够，够就直接扣款，不够就提醒 
4. 可随时退出，退出时，打印已购买商品和余额
5. 如余额不足，可充值

#coding=utf-8
#Version:python 3.6.0
#Tools:Pycharm 2017.3.2
_date_ = '2018/4/16/016 14:50'
_author_ = 'Hongyong'

salary = int(input("Please input your salary: "))
shopping_mart = []
items = (["Huawei","￥",2800],
         ["Earphone","￥",300],
         ["Book","￥",80])
msg_items = '''
----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------
'''
while True:
    print(msg_items)
    user_choice = input("Please choose goods: ")
    if user_choice.isdigit():
        p_index = int(user_choice)
        if p_index > 0 and p_index <= len(items):
            if salary >= items[p_index - 1][2]:
                shopping_mart.append(items[p_index- 1])
                salary -= int(items[p_index - 1][2])
                print("You have bought {name} !".format(name=items[p_index - 1][1]))
                print("Your balance is: ￥", salary)
            else:
                print("Your balance is not enough! Please try sth else.")
                recharge_ans = input("Do you want to recharge?")
                if recharge_ans == "y":
                    recharge = int(input("Please input money: "))
                    print("Please wait for a while...")
                    salary += recharge
                    print("You have recharged successfully!")
                    print("And the balance is: ", salary, "now!")
        else:
            print("Invalid Choice!")
            print("You are supposed to enter from 1 to",len(items))
    elif user_choice == "q":
        print("---------shopping list------------")
        for index, ite in enumerate(shopping_mart):
            print(index + 1, ite)
        print("Your balance is: ￥", salary)
        print("Welcome your next coming!")
        print("Exit...")
        exit()
    else:
        print("Invalid Choice!")
        print("You are supposed to enter from 1 to", len(items))

　　程序效果

Please input your salary: 2

----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------

Please choose goods: 1
Your balance is not enough! Please try sth else.
Do you want to recharge?y
Please input money: 20000
Please wait for a while...
You have recharged successfully!
And the balance is:  20002 now!

----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------

Please choose goods: 1
You have bought ￥ !
Your balance is: ￥ 17202

----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------

Please choose goods: 
Invalid Choice!
You are supposed to enter from 1 to 3

----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------

Please choose goods: 2
You have bought ￥ !
Your balance is: ￥ 16902

----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------

Please choose goods: 
Invalid Choice!
You are supposed to enter from 1 to 3

----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------

Please choose goods: 3
You have bought ￥ !
Your balance is: ￥ 16822

----------items----------
1. Huawei     ￥  2800
2. Earphone   ￥  300
3. Book       ￥  80
-------------------------

Please choose goods: q
---------shopping list------------
1 ['Huawei', '￥', 2800]
2 ['Earphone', '￥', 300]
3 ['Book', '￥', 80]
Your balance is: ￥ 16822
Welcome your next coming!
Exit...

Process finished with exit code 0