1 '''  2 一、元素分类  3   4 有如下值集合 [11,22,33,44,55,66,77,88,99,90...]，将所有大于 66 的值保存至字典的第一个key中，将小于 66 的值保存至第二个key的值中。  5 即： {'k1': 大于66的所有值, 'k2': 小于66的所有值}  6 '''  7 li = [11,22,33,44,55,66,77,88,99,90]  8 k1 = ''  9 k2 = '' 10 li = {} 11 for i in li: 12     if i > 66: 13         k1 = k1 + str(i) 14     if i < 66: 15         k2 = k2 + str(i) 16 li.update(k1 = '大于66的所有值',k2 = '小于66的所有值') 17 print(li) 18 print(k1,k2) 19  20 ''' 21 二、查找 22 查找列表中元素，移除每个元素的空格，并查找以 a或A开头 并且以 c 结尾的所有元素。 23     li = ["alec", " aric", "Alex", "Tony", "rain"] 24     tu = ("alec", " aric", "Alex", "Tony", "rain")  25     dic = {'k1': "alex", 'k2': ' aric',  "k3": "Alex", "k4": "Tony"} 26 ''' 27 li = ["alec", " aric", "Alex", "Tony", "rain"] 28 tu = ("alec", " aric", "Alex", "Tony", "rain") 29 dic = {
   'k1': "alex", 'k2': ' aric', "k3": "Alex", "k4": "Tony"} 30  31 new_dic = {} 32 for i in dic.keys(): 33     dic[i] = dic[i].strip() 34     if (dic[i].startswith('a') or dic[i].startswith('A')) and dic[i].endswith('c'): 35         new_dic.update(i=dic[i]) 36 print(new_dic) 37 print(dic) 38  39 先将tuple转换为list，修改后，在转换回去 40 i = 0 41 new_tu = list(tu) 42 new_tu1 = [] 43 while i < len(new_tu): 44     new_tu[i] = new_tu[i].strip() 45     if  (new_tu[i].startswith("a") or new_tu[i].startswith("A")) and new_tu[i].endswith("c"): 46         new_tu1.append(new_tu[i]) 47     i += 1 48 print(tuple(new_tu)) 49 print(tuple(new_tu1)) 50  51  52 i = 0 53 new_li = [] 54 # print(type(new_li)) 55 while i < len(li): 56     li[i] = li[i].strip() 57     if (li[i].startswith("a") or li[i].startswith("A")) and li[i].endswith("c"): 58         new_li.append(li[i]) 59     i += 1 60 print(li) 61 print(new_li) 62  63 ''' 64 三、输出商品列表，用户输入序号，显示用户选中的商品 65     商品 li = ["手机", "电脑", '鼠标垫', '游艇'] 66 ''' 67 li = ["手机", "电脑", '鼠标垫', '游艇'] 68 for k, v in enumerate(li, 1): 69     print(k, v) 70 while True: 71     s = int(input("输入商品序列号：")) 72     if s < len(li): 73         print(li[s]) 74     else: 75         print("没有该商品序列号") 76  77 ''' 78 四、购物车 79 goods = [ 80     {"name": "电脑", "price": 1999}, 81     {"name": "鼠标", "price": 10}, 82     {"name": "游艇", "price": 20}, 83     {"name": "美女", "price": 998}, 84 ] 85 功能要求： 86     要求用户输入总资产，例如：2000 87     显示商品列表，让用户根据序号选择商品，加入购物车 88     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。 89     附加：可充值、某商品移除购物车 90 ''' 91 salary = int(input("输入您的总资产：")) 92 goods = [ 93     {
   "name": "电脑", "price": 1999}, 94     {
   "name": "鼠标", "price": 10}, 95     {
   "name": "游艇", "price": 20}, 96     {
   "name": "美女", "price": 998}, 97 ] 98 i = 1 99 while i <= len(goods):100     print(i, '>>>', goods[i - 1]['name'])101     i += 1102 103 shoping_car = []104 while True:105     num = input('选择商品序列号[按q 退出]：')106     if num != 'q':107         num = int(num)108         if goods[num - 1]['price'] < salary:109             salary = salary - goods[num - 1]['price'] 　　　　　　　　　 a = salary # 保存余额状态110             shoping_car.append(goods[num - 1]['name'])111         else:112             print("你的余额不足,请充值")113             salary = input('输入充值额度[按q 退出]:')114             if salary == 'q': 　　　　　　　　　　　　salary = a # 将余额状态赋值给salary115                 break116             else:117                 salary = int(salary)118             continue119 120     else:121         print('谢谢惠顾')122         break123 print('你的余额:', salary)124 print('购买的商品:', shoping_car)125 126 '''127 ***************执行结果***************128 输入您的总资产：2000129 1 >>> 电脑130 2 >>> 鼠标131 3 >>> 游艇132 4 >>> 美女133 选择商品序列号[按q 退出]：1134 选择商品序列号[按q 退出]：1135 你的余额不足,请充值136 输入充值额度[按q 退出]:1000137 选择商品序列号[按q 退出]：4138 选择商品序列号[按q 退出]：1139 你的余额不足,请充值140 输入充值额度[按q 退出]:q141 你的余额: q142 购买的商品: ['电脑', '美女']143 '''144 145 '''146 五、用户交互，显示省市县三级联动的选择147 dic = {148     "河北":{149         "石家庄" :["鹿泉","藁城","元氏"],150         "邯郸" : ["永年","涉县","磁县"]151     },152     "河南":{153         "郑州":["巩义","登封","新密"],154         "开封":["金明","鼓楼","通许"]155     },156     "山西":{157         "太原":["古交","清徐","阳曲"],158         "大同":["天镇","阳高","广灵"]159     }160 }161 需求：162     （1. 运行程序输出第一级菜单163     （2. 选择一级菜单某项，输出二级菜单，同理输出三级菜单    164     （4. 让用户选择是否要退出165     （5. 有返回上一级菜单的功能166 '''167 dic = {168     "河北": {169         "石家庄": ["鹿泉", "藁城", "元氏"],170         "邯郸": ["永年", "涉县", "磁县"]171     },172     "河南": {173         "郑州": ["巩义", "登封", "新密"],174         "开封": ["金明", "鼓楼", "通许"]175     },176     "山西": {177         "太原": ["古交", "清徐", "阳曲"],178         "大同": ["天镇", "阳高", "广灵"]179     }180 }181 print("一级菜单".center(20, '-'))182 183 current_layer = dic184 parent_layer = []185 186 while True:187     for k in current_layer:188         print('>>>>> ', k)189     menu = input('请选择[按q退出/按b返回上一级]:').strip()190     if len(menu) == 0: continue191     if menu != 'q':# 退出192         if menu in current_layer:193             if type(current_layer) == dict: #第三层是列表，在往下会出错，所以用if条件判断194                 parent_layer.append(current_layer)195                 current_layer = current_layer[menu]196             else:197                 print('最后一层了'.center(20,'-'))198         elif menu == 'b':#返回199             if parent_layer:200                 current_layer = parent_layer.pop()201                 if current_layer == dic:202                     print('这是第一层了'.center(20,'-'))203         else:204             print('重新输入'.center(20,'-'))205     else:206         break