习题四 答案
方案一：
1 goods = [ 2 {"name": "电脑", "price": 1999}, 3 {"name": "鼠标", "price": 10}, 4 {"name": "游艇", "price": 20}, 5 {"name": "美女", "price": 998} 6 ] 7 def chongzhi(): 8 global zongzichan 9 e = int(input("请输入充值金额:")) 10 zongzichan = zongzichan + e 11 print("充值成功,返回购物车.") 12 gouwuche() 13 14 def gouwuche(): 15 global zongzichan 16 xiaofei = 0 17 print("您选购的商品如下:") 18 for c, c1 in enumerate(list, 1): 19 for c2, c3 in c1.items(): 20 xiaofei = xiaofei + c3 21 print(c, c2, c3) 22 print("总价格:", xiaofei) 23 while True: 24 d = input("请选择结算(yes) or 前往充值(no):") 25 if d == "yes" and zongzichan >= 0: 26 print("购买成功,您一共消费了:", xiaofei, "总资产剩余:", zongzichan) 27 print("欢迎下次光临,再见.") 28 break 29 elif d == "yes" and zongzichan < 0: 30 d1 = input("购买失败,余额不足,请选择前往充值(yes) or 前往购物车移除商品(no):") 31 if d1 == "yes": 32 chongzhi() 33 elif d1 == "no": 34 d2 = int(input("请输入商品编号移除出购物车:")) 35 d3 = list[d2-1] 36 for d4, d5 in d3.items(): 37 zongzichan = zongzichan + d5 38 del list[d2-1] 39 print("您移除了:", d4, d5) 40 gouwuche() 41 else: 42 print("指令错误") 43 elif d == "no": 44 chongzhi() 45 else: 46 print("指令错误") 47 48 exit() 49 50 def shangpin(): 51 global list 52 global zongzichan 53 list = [] 54 while True: 55 print("商品编号、名称、价格列表:") 56 for keys, a in enumerate(goods, 1): 57 a1 = a.get("name") 58 a2 = a.get("price") 59 print(keys, a1, a2) 60 dict = {} 61 a3 = int(input("请输入商品编号将其加入购物车:")) 62 zongzichan = zongzichan - goods[a3-1]["price"] 63 a4 = goods[a3-1]["name"] 64 a5 = goods[a3-1]["price"] 65 print("商品:",goods[a3-1]["name"], "价格:",goods[a3-1]["price"], "已加入购物车.") 66 dict[a4] = a5 67 list.append(dict) 68 b = input("请选择继续购物(yes) or 去购物车结算(no):") 69 if b == "yes": 70 continue 71 elif b == "no": 72 gouwuche() 73 else: 74 print("指令错误") 75 76 def zichan(): 77 global zongzichan 78 zongzichan = int(input("请输入总资产:")) 79 shangpin() 80 81 zichan()
方案二（无充值）：
1 goods = [ 2 {"name": "电脑", "price": 1999}, 3 {"name": "鼠标", "price": 10}, 4 {"name": "游艇", "price": 20}, 5 {"name": "美女", "price": 998} 6 ] 7 8 zongzichan = int(input("请输入总资产：")) 9 xiaofei = 0 10 gouwuche = {} 11 for a in goods: 12 print(a["name"], a["price"]) 13 14 while True: 15 shangpin = input("请输入商品名称加入购物车 or 输入Y/y去购物车结算：") 16 if shangpin.lower() == "y": 17 break 18 for a1 in goods: 19 if a1["name"] == shangpin: 20 if a1["name"] in gouwuche.keys(): 21 gouwuche[a1["name"]]["num"] = gouwuche[a1["name"]]["num"] + 1 22 else: 23 gouwuche[a1["name"]] = {"num":1, "jiage":a1["price"]} 24 25 for b , b1 in gouwuche.items(): 26 b2 = b1["jiage"] 27 b3 = b1["num"] 28 b4 = b2 * b3 29 xiaofei = xiaofei + b4 30 if xiaofei > zongzichan: 31 print("购买失败，余额不足") 32 else: 33 print("购买成功")
