作业一：购物车程序

  1 # 1.三级菜单
  2 menu = {
  3     ‘北京‘:{
  4         ‘海淀‘:{
  5             ‘五道口‘:{
  6                 ‘soho‘:{},
  7                 ‘网易‘:{},
  8                 ‘google‘:{}
  9             },
 10             ‘中关村‘:{
 11                 ‘爱奇艺‘:{},
 12                 ‘汽车之家‘:{},
 13                 ‘youku‘:{},
 14             },
 15             ‘上地‘:{
 16                 ‘百度‘:{},
 17             },
 18         },
 19         ‘昌平‘:{
 20             ‘沙河‘:{
 21                 ‘老男孩‘:{},
 22                 ‘北航‘:{},
 23             },
 24             ‘天通苑‘:{},
 25             ‘回龙观‘:{},
 26         },
 27         ‘朝阳‘:{},
 28         ‘东城‘:{},
 29     },
 30     ‘上海‘:{
 31         ‘闵行‘:{
 32             "人民广场":{
 33                 ‘炸鸡店‘:{}
 34             }
 35         },
 36         ‘闸北‘:{
 37             ‘火车战‘:{
 38                 ‘携程‘:{}
 39             }
 40         },
 41         ‘浦东‘:{},
 42     },
 43     ‘山东‘:{},
 44 }
 45
 46 exit_tag=True
 47 while exit_tag:
 48     for key in menu:
 49         print(key)
 50     choice=input(‘>: ‘).strip()
 51     if choice == ‘quit‘:
 52         exit_tag=False
 53         continue
 54     if len(choice) == 0:
 55         continue
 56
 57     if choice in menu:
 58         while exit_tag:
 59             first= menu[choice]
 60             for key2 in second: #第二层循环
 61                 print(key2)
 62             choice2=input(‘>>：‘).strip()
 63             if choice2 == ‘bye‘:
 64                 break
 65             if choice2 == ‘quit‘:
 66                 exit_tag = False
 67                 continue
 68             if len(choice2) == 0:
 69                 continue
 70             if choice2 in first:
 71                 while exit_tag:
 72                     second = first[choice2]
 73                     for key3 in second: #第三层
 74                         print(key3)
 75                     choice3 = input(‘>>>: ‘).strip()
 76                     if choice3 == ‘bye‘:
 77                         break
 78                     if choice3 == ‘quit‘:
 79                         exit_tag = False
 80                         continue
 81                     if  choice3 in third:
 82                         third = second[choice3]
 83                         for key4 in third:
 84                             print(key4)
 85                         choice4 = input(‘>>>>: ‘).strip()
 86                         if  choice4 == ‘bye‘:
 87                             break
 88                         if choice4 == ‘quit‘:
 89                             exit_tag=False
 90                             continue
 91 #
 92 # 2.购物车程序：
 93 good = {
 94     ‘1‘:{‘apple‘: 100},
 95     ‘2‘:{‘tesla‘: 100},
 96     ‘3‘:{‘mac‘: 100},
 97     ‘4‘:{‘lenovo‘: 100},
 98     ‘5‘:{‘chicken‘: 100},
 99 }
100 shoping_list = []
101 exit_tag = True
102 count = 0
103 while exit_tag:
104     account = input(‘your acconut: ‘).strip(‘|‘)
105     password = input(‘your password: ‘).strip()
106     with open(‘login.txt‘, ‘r‘) as file:
107         pair = file.read().split(‘|‘)
108         name, secert = pair
109         # print(name,secert)
110     if account not in pair:
111         print(‘用户名不存在‘)
112     if account == name and password == secert:
113         print(‘登陆成功‘)
114         salary = input(‘请输入你的工资： ‘).strip()
115         if salary == ‘quit‘:
116             exit_tag = False
117             continue
118         if not salary.isdigit():
119             print(‘请重新输入（工资必须为数字)：‘)
120         else:
121             salary_balance = int(salary)
122             while exit_tag:
123                 for key in good:
124                     print(key,good[key])
125                 serial = input(‘请输入商品编号： ‘).strip()
126                 if serial == ‘quit‘:
127                     exit_tag = False
128                     continue
129                 if serial in good:
130                     number = input(‘请输入购买的商品个数：‘).strip()
131                     if  number.isdigit():
132                         goods_name = list(good[serial])[0]
133                         goods_price = good[serial][goods_name]
134                         print(‘你选择购买的商品为：%s  单价为：%s  购买个数为： %s‘ %(goods_name,goods_price,number))
135                         shoping_list.append((goods_name,goods_price,number))
136                         goods_sum = int(goods_price)*int(number)
137                         salary_balance -= goods_sum
138                         if salary_balance < 0:
139                             print(‘你的账户余额不足，退出!‘)
140                             exit_tag = False
141                             continue
142                         else:
143                             continue
144                     else:
145                         print(‘商品个数必须为数字：‘)
146                 else:
147                     print(‘请输入正确的商品编号： ‘)
148             print(‘你的购物清单为%s \n‘ %(shoping_list))
149     else:
150         print(‘你输入的密码不对，请重新输入！‘)
151         count += 1
152     if count > 2:
153         print(‘你尝试的次数过多，请稍后再试！‘)
154         exit_tag =False
155         continue

原文地址：https://www.cnblogs.com/lincappu/p/8143867.html