Python购物车的两种写法

需求：

1.输入funds，给出货品列表

循环进行选择    
2.根据货品编号进行选择
3.加入购物车

4.退出系统，输出余额

 

一.直接用列表形式存详细货品信息，进行数据处理：

#！/user/bin/env python
# -*- coding:utf-8 -*-
Goodslist=\
    [
        '1 Iphone 5800',
        '2 Huawei 4699',
        '3 LuckinCoffee 27',
        '4 Alex Python 81',
        '5 Niu E-bicycle 1580'
    ]
#print('Please input your shopping funds:\n')
Funds = input('Please input your shopping funds:\n', )
Bought_List=[]
'''
print(Goodslist)
import re
price = re.findall(r'\d+\.?\d', Goodslist[1])
print(type(price))
Goodsprice=price[0]
print(type(Goodslist))
#print(Goodslist[Num-1])
#print(Goodsname)
'''
if Funds.isdigit():
    Funds=int(Funds)
    while True:
        print('If you input "q", you will qiut the system!')
        Num = input('Select your goods_num:\n')
        if Num.isdigit():
            Num=int(Num)
            if Num<len(Goodslist)+1 and Num>=0:
                import re
                price= re.findall(r'\d+\.?\d', Goodslist[int(Num)-1])
                Goodsprice=price[0]
    #print(re.findall(r'\d+\.?\d',Goodslist[int(Num)-1]))
    #print(price[0])
    #print(price[0])
    #print(Goodslist[Num - 1].replace(' ', ''))
                Goodsname = ''.join(re.findall(r'[A-Za-z]', Goodslist[int(Num) - 1].replace(' ', '')))
                Goodsname1=Goodsname[0]
                Goodsinfo = []
                if Funds>=int(Goodsprice):#买得起
                    Funds -= int(Goodsprice)
                    Goodsinfo.append(Goodsname1)
                    Goodsinfo.append(Goodsprice)
                    Bought_List.append(Goodsinfo)
                    print('Added %s to your shopping cart!, your balance is \033[31;1m%s\033[0m'%(Goodsname1,Funds))
                else:
                    print('\033[31;1mYour balance is[%s]\033[0m' % (Funds))
            else:
                print('Nonexistent item')
        elif Num=='q':
            print('----shopping list----')
            for p in Bought_List:
                print(p)
            print('Your balance:',Funds)
            exit()
        else:
            print('invalid option')

else:
    print('请正确输入你的资金数')

 

二.以元组放在列表中的形式存货品信息：

 

#！/user/bin/env python
# -*- coding:utf-8 -*-

#一一对应不可取
#productlist=[]
#price_list=[]

product_list=[
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Coffee',31),
    ('Alex Python',120)
]
shopping_list=[]
salary=input('Input your salary:\n')
if salary.isdigit():#isdigit判断是数字但是是str类型的值
    salary=int(salary)
    while True:
        for index,item in enumerate(product_list):
            #print(product_list.index(item),item)
            print(index,item)
        User_choice=input('选择买的产品:\n')
        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:#买得起
                    shopping_list.append(p_item)
                    salary-=p_item[1]
                    print('Added %s into shopping cart, your current balance is \033[31;1m%s\033[0m'%(p_item,salary))
                else:
                    print('\033[31;1m你的余额只剩[%s]了\033[0m'%(salary))
            else:
                print('选择不存在')
        elif User_choice=='q':
            print('----shopping list----')
            for p in shopping_list:
                print(p)
            print('Your balance:\n',salary)
            exit()
        else:
            print('invalid option')
else:
    print('请正确输入你的资金数')