使用python3实现的简单购物车程序
用户入口
1、第一次需要输入自己的金额，下次购买会记录上一次所剩的余额
2、用户只需要输入对应商品前面的序号即可将商品添加进购物车
3、能够记录用户购买商品的历史记录，并每次退出程序后显示总的购买情况
商家入口
1、商家需要通过账号验证进入
2、商家能够对商品进行添加以及修改商品的价格
可以自行考虑一些其余的功能添加上去
1 #!/usr/bin/env python 2 #coding:utf-8 3 4 import os 5 6 def text_save(filename, data): ##定义函数将列表存入到文件里面 7 file = open(filename,'w') 8 for i in range(len(data)): 9 s = str(data[i]).replace('[','').replace(']','') 10 s = s.replace("'",'').replace(',','') +'\n' 11 file.write(s) 12 file.close() 13 14 size = os.path.getsize('shopping.txt') #判断存商品的文件是否为空，如果为空，则使用自定义的商品初始值 15 if size == 0: 16 shopping = [['phone',2800],['snacks',200],['watch',1200],['cloths',500]] 17 else: 18 shopping = [] 19 with open('shopping.txt','r') as f: 20 for data in f.readlines(): 21 shopping.append(data.split(' ')) 22 for data2 in range(len(shopping)): 23 shopping[data2][1] = shopping[data2][1].rstrip('\n') 24 shopping[data2][1] = int(shopping[data2][1]) 25 26 27 shopping_list = [] #定义用户购买的商品列表 28 29 30 with open('shopping_cart.txt','r') as f1: #打开存取用户商品的文件，并将已购买的商品读取保存到列表里 31 for j in f1.readlines(): 32 shopping_list.append(j.split(' ')) 33 for j2 in range(len(shopping_list)): 34 shopping_list[j2][1] = shopping_list[j2][1].rstrip('\n') 35 36 37 with open('user.txt','r') as f: #需要事先在文件里面写上验证的用户，这里只定义了一个admin用户，用于区分是用户还是商家 38 userlist = f.readlines() 39 for i in range(len(userlist)): 40 userlist[i] = userlist[i].strip('\n') 41 42 43 role = input('if or not you are admin?(y|n)：') #简单判断是进入到用户入口还是商家入口 44 45 #用户入口 46 if role == 'n': 47 size = os.path.getsize('salary.txt') #若保存工资的文件为空,则需要用户手动输入自己的余额,否则直接读取里面保存的余额 48 if size == 0: 49 money = input('please input your RMB:') 50 else: 51 with open('salary.txt','r') as f3: 52 money = f3.read() 53 flag1 = False 54 if money.isdigit(): 55 money = int(money) 56 while not flag1: 57 for index,item in enumerate(shopping):#获取商品的列表以及对应的下标,用户选择对应的序号即可添加商品到购物车 58 print(index,item) 59 product_choice = input("你需要选择什么商品>>>") 60 if product_choice.isdigit(): 61 product_choice = int(product_choice) 62 if product_choice < len(shopping) and product_choice >=0:#判断选择购买的商品是否在列表里存在 63 product_item = shopping[product_choice] 64 if product_item[1] <= money: #判断余额是否足够 65 shopping_list.append(product_item) 66 money -= product_item[1] 67 print("add [%s] into your shopping cart and Your remaining balance is \033[31;1m%s\033[0m" %(product_item[0],money)) 68 else: 69 print("\033[41;1m你的余额不足，请及时充值...\033[0m") 70 else: 71 print("没有这个商品，请选择其余物品...") 72 73 elif product_choice == 'q': 74 print(''' 75 ---------------------- 76 你的购物车当前的商品有:''') 77 for i in shopping_list: 78 print(i) 79 print("your remaining balance is",money) 80 flag1 = True 81 else: 82 print("invalid input") 83 with open('salary.txt','w') as f4: 84 f4.write(str(money)) 85 text_save('shopping_cart.txt',shopping_list) 86 87 88 #商家入口 89 elif role == 'y': 90 flag = False 91 i = 0 92 while not flag: 93 user = input('please input your admin user：') 94 print(user,type(user)) 95 if user in userlist: 96 while not flag: 97 i = 0 98 change = input("do you want to modify shopping?(y|n)：") 99 if change == 'y': 100 while not flag: 101 change1 = input("add shopping(1) or modify shopping price(2),(1|2|q)：") #通过判断商家是需要添加商品还是修改商品价格,或者可以直接退出 102 if change1 == '1': 103 add_shop = input('please input shopping that you want to add!') 104 shop_price = input('please input shopping price!') 105 shopping.append([add_shop,shop_price]) 106 elif change1 == '2': 107 for index1,item1 in enumerate(shopping): #获取到需要修改的商品对应的列表和下标 108 print(index1,item1) 109 mod_shopping = input('what shopping price do you want to modify?') 110 if mod_shopping.isdigit(): #判断输入的是否为数字,并且将字符串类型转换为int 111 mod_shopping = int(mod_shopping) 112 change_shopping = shopping[mod_shopping][0] 113 mod_price = input('how much do you want to change?') 114 if mod_price.isdigit(): #默认输入的价格是str类型,需要转换为int 115 mod_price = int(mod_price) 116 shopping[mod_shopping] = [change_shopping,mod_price] 117 elif change1 == 'q': 118 print("exiting...") 119 flag = True 120 else: 121 print("invalid option...") 122 elif change == 'n': 123 print("正在退出管理商品终端...") 124 flag = True 125 else: 126 pass 127 else: 128 print('您的验证错误，请重新输入正确的用户：') 129 i = i+1 130 if i >= 3: 131 print('你已经连续输错了三次，将自动退出。。') 132 flag = True 133 text_save('shopping.txt',shopping) 134 135 else: 136 print('invalid option...')