三级菜单：
1. 运行程序输出第一级菜单
2. 选择一级菜单某项，输出二级菜单，同理输出三级菜单
3. 菜单数据保存在文件中
1 # 创造三级菜单 2 shoppingmall = {'clothes':{'skirt':['s', 'm', 'l'], 'shikt':['s', 'm', 'l'], 'coat':['s', 'm', 'l'],}, 3 'phone':{'Apple':['5', '6', '7'], 'Xiaomi':['1', '2', '3'], 'Huawei':['6', '7', '8']}, 4 'friut':{'apple':['1kg','2kg','3kg'],'pear':['1kg','2kg','3kg'], 'banana':['1kg','2kg','3kg']}} 5 list1=[] 6 list2=[] 7 8 # 打印一级菜单 9 total_count = 0 10 for x in range(3): 11 count = 0 12 for i in range(3): 13 for key in shoppingmall: 14 print(key) 15 list1.append(key) 16 # 选择一项到下一级菜单或者退出 17 choose = input('Please chose thing or q = quit:') 18 if choose == 'q': 19 exit('Bye!') 20 # 进入下一级菜单 21 elif choose in list1: 22 a = shoppingmall.get(choose) 23 count1 = 0 24 for y in range(3): 25 for key1 in a: 26 print(key1) 27 list2.append(key1) 28 29 # 选择一项到下一级菜单或者退出或返回 30 choose1 = input('Please chose that you want or q = quit or b = back :') 31 if choose1 == 'q': 32 exit('Bye!') 33 34 elif choose1 == 'b': 35 count += 1 36 break 37 if count == 3: # 选择不能超过三次 38 print('Sorry, your choose is over the limit.') 39 elif choose1 in list2: 40 # 进入下一级菜单 41 b = a.get(choose1) 42 for key2 in b: 43 print(key2) 44 # 选择退出，返回上一级菜单 或者第一个菜单 45 choose2 = input('Please chose that q = quit or b = back or 1st = the first list') 46 if choose2 == 'q': 47 exit('Bye!') 48 elif choose2 == 'b': 49 count1 += 1 50 51 if count1 == 3: 52 print('Sorry, your choose is over the limit.') 53 break 54 elif choose2 == '1st': 55 56 total_count += 1 57 break 58 59 if total_count == 3: 60 print('Sorry, your choose is over the limit.') 61 else: 62 print('Sorry, your choose not in list! Please choose again') 63 else: 64 print('Sorry, your choose not in list!Please choose again') 65 else: 66 print('Sorry, your choose not in list! Please choose again') #选择物品不在名单里