Shopping card

这是一个购物车功能，具备判断商品展示和用户余额是否足以购买商品功能，购买商品后显示已购买的物品并给出余额提示。

未加异常情况判断，在使用时记得添加异常情况判断。

1、第一种方法，使用字典完成。

#!/usr/bin/env python
#-*- coding:utf-8 -*-
# Li Rong Yang

commodity = {'Electric appliance':{
                'Iphone':'5699','televison':'2300','computer':'2000'},
             'Fruits':{
                 'cherry':'100','strawberry':'20','blueberry':'36'},
             'Kid toy':{
                 'cats':'5000','giraffe':'3600','elephant':'3000'}
             }
shopping_card_list = []

salary = int(input("Please enter your salary: "))#提示用户输入

while True:
    print("----------- Product list ----------")
    _index_count = 0
    for cd in commodity.keys():#打印商品类型
        _index_count += 1
        print(str(_index_count) + '  ' + cd )

    print('')
    user_select_tepy = input("Please enter the type of item you want to buy.")#提示用户选择要购物商品类型

    _index_count = 0
    print("----------- Product list ----------")
    for product_name,producr_price in commodity[user_select_tepy].items():#打印商品类型中有哪些产品
        _index_count += 1
        print(str(_index_count) + " " + product_name + " " + producr_price + '￥')

    user_select_product = input('Please select the item you want to buy.')#让用户选择购买的产品

    if salary - int(commodity[user_select_tepy][user_select_product]) >0:#判断用户的工资是否大于产品价格
        print('')

        salary = salary- int(commodity[user_select_tepy][user_select_product])
        print('Your bank card still has a balance {balance}'.format(balance = salary))


        shopping_card_list.append(user_select_product)
        print('----------- Shopping card list -----------')
        _index_count = 0
        for SCL in shopping_card_list:
            _index_count += 1
            print(str(_index_count) + ' ' + SCL)
        print('')

    else:
        print('Your bank card balance is insufficient !!!')

2、第二种方法，使用列表+元组完成

#!/usr/bin/env python
#-*- coding:utf-8 -*-
# Li Rong Yang
product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Coffee',31),
    ('Alex Python',120),
]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit():
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list):
            #print(product_list.index(item),item)
            print(index,item)
        user_choice = input("选择要买嘛？>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >=0:
                p_item = product_list[user_choice]
                if p_item[1] <= salary: #买的起
                    shopping_list.append(p_item)
                    salary -= p_item[1]
                    print("Added %s into shopping cart,your current balance is 33[31;1m%s33[0m" %(p_item,salary) )
                else:
                    print("33[41;1m你的余额只剩[%s]啦，还买个毛线33[0m" % salary)
            else:
                print("product code [%s] is not exist!"% user_choice)
        elif user_choice == 'q':
            print("--------shopping list------")
            for p in shopping_list:
                print(p)
            print("Your current balance:",salary)
            exit()
        else:
            print("invalid option")