购物车
功能要求：
要求用户输入总资产，例如：2000
显示商品列表，让用户根据序号选择商品，加入购物车
购买，如果商品总额大于总资产，提示账户余额不足，否则，购买成功。
购买成功，打印购买的商品列表
扩展：
登录验证
1 user_status = False
2 def login():
3 name_list = [
4 {'username': '张三', 'password': '123'},
5 {'username': '李四', 'password': '456'},
6 {'username': '王二', 'password': '789'},
7 ]
8 global user_status
9 if user_status == False:
10 username = input("请输入用户名:").strip()
11 password = input("请用户密码:").strip()
12 for i in name_list:
13 if username == i["username"] and password == i["password"]:
14 print("login successfully")
15 user_status = True
16 break
17 else:
18 print("User name or password error.")
19 exit()
20 else:
21 print("用户已登录，验证成功")
22
23
24 def shopping():
25 login()
26 list_cart = []
27 goods = [{"name": "电脑", "price": 1999},
28 {"name": "鼠标", "price": 10},
29 {"name": "游艇", "price": 20},
30 {"name": "美女", "price": 998},
31 ]
32 gongzi = input("请输入您的工资:")
33 while not gongzi.isdigit():
34 print("输入内容只能由数字组成")
35 gongzi = input("输入有误，请输入正确格式:")
36 gongzi = int(gongzi)
37 while True:
38 print("商品列表".center(50, "#"))
39 print("编号".center(8, " "), "名称".center(30, " "), "价格".ljust(10, " "))
40 print("".center(53, "-"))
41 for i in goods:
42 print(str(goods.index(i)).center(10, " "), str(i["name"]).center(30, " "), str(i["price"]).ljust(10, " "))
43 print("".center(53, "-"))
44 bianhao = input("请您输入商品编号或q:")
45 if bianhao.isdigit():
46 bianhao = int(bianhao)
47 if bianhao >= 0 and bianhao < int(len(goods)):
48 if (gongzi - goods[bianhao]["price"]) >= 0:
49 list_cart.append(goods[bianhao])
50 gongzi -= goods[bianhao]["price"]
51 print("\033[32;1m您的预算还有%d\033[0m" % gongzi)
52 else:
53 print("\033[1;31;1m余额不足啦...\033[0m")
54 else:
55 print("您输入的商品不存在")
56 elif bianhao == "q":
57 break
58 else:
59 print("\033[32;1m您输入有误\033[0m")
60 print("\033[32;1m还剩%d元\033[0m" % gongzi)
61 print("购物车详情".center(50,"#"))
62 print("编号".center(8, " "), "名称".center(30, " "), "价格".ljust(10, " "))
63 print("".center(53, "-"))
64 for i in list_cart:
65 print(str(list_cart.index(i)).center(10, " "), str(i["name"]).center(30, " "), str(i["price"]).ljust(10, " "))
66 print("".center(53, "-"))
67
68 shopping()
