# 一、元素分类# 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。# 即： {‘k1‘: 大于66的所有值, ‘k2‘: 小于66的所有值}# a = [11,22,33,44,55,66,77,88,99]# b = []# c = []# dict = {"k1":b,"k2":c}# for i in a:#     if i >66:#         b.append(i)#     if i <66:#         c.append(i)# print(dict)# 二、查找# 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。# li = ["alec", " aric", "Alex", "Tony", "rain"]# tu = ("alec", " aric", "Alex", "Tony", "rain")# dic = {‘k1‘: "alex", ‘k2‘: ‘ aric‘, "k3": "Alex", "k4": "Tony"}# for i in li:#      i = i.strip()#      if (i.startswith(‘A‘) or i.startswith(‘a‘)) and i.endswith(‘c‘) :#          print(i)# for i in tu:#      i = i.strip()#      if (i.startswith(‘A‘) or i.startswith(‘a‘)) and i.endswith(‘c‘) :#          print(i)# for i in dic.values():#      i = i.strip()#      if (i.startswith(‘A‘) or i.startswith(‘a‘)) and i.endswith(‘c‘):#          print(i)# 三、输出商品列表，用户输入序号，显示用户选中的商品# 商品# li = ["手机", "电脑", ‘鼠标垫‘, ‘游艇‘]# while True:#     choice=int(input(‘请输入序号：‘))#     print(li[choice])# 四、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。# 附加：可充值、某商品移除购物车# goods = [#     {"name": "电脑", "price": 1999},#     {"name": "鼠标", "price": 10},#     {"name": "游艇", "price": 20},#     {"name": "美女", "price": 998},# ]# shopping_cart=[]# flag=True# sum=0# while flag:#     money=input("请输入您的账户金额：").strip()#     if money.isdigit():#         money=int(money)#         print("商品列表:")#         while flag:#             for i in range(len(goods)):#                 print(i+1,goods[i]["name"],goods[i]["price"])#             choice=input("请选择您需要购买的商品或退出(q)：").strip()#             num=0#             if choice.isdigit():#                 choice=int(choice)#                 choice=choice-1#                 if choice >=0 and choice <len(goods):#                     if money > goods[choice][‘price‘]:#                         product=goods[choice]#                         if product in shopping_cart:#                             num+=1#                         else:#                             shopping_cart.append(product)#                         money = money - goods[choice ]["price"]#                         sum+=goods[choice ]["price"]#                         print("购买成功,您购买了"+goods[choice][‘name‘],‘您还剩‘+str(money)+‘元钱‘)#                     elif money<goods[choice][‘price‘]:#                         print("对不起，您的账户余额不足！")#                         flag=False#                 else:#                     print(‘商品不存在‘)#                     continue#             elif choice.lower()==‘q‘:#                 print(‘---购物清单---：‘)#                 for k,v in enumerate(shopping_cart,1):#                     print(k,v[‘name‘],v[‘price‘],num)#                 print(‘共消费‘+str(sum)+‘元‘+‘\n您的余额是‘+str(money)+‘元‘+‘\n---结束购物---‘)#                 flag=False#             else:#                 print(‘请输入数字或q‘)#                 continue#     else:#         print(‘请输入数字‘)#         continue# 选做题：用户交互，显示省市县三级联动的选择dic = {    "河北": {        "石家庄": ["鹿泉", "藁城", "元氏"],        "邯郸": ["永年", "涉县", "磁县"],    },    "河南": {        ‘a‘:[1,2,3],        ‘c‘:[4,5,6]    },    "山西": {       ‘d‘:[7,8,9],        ‘e‘:[10,11,12]    }}# 第一种# flag=True# while flag:#     for i in dic:#         print(i)#     choice1=input(‘>>:‘).strip()#     if choice1.upper()==‘Q‘:#         break#     next1=dic[choice1]#     for j in next1:#         print(j)#     while flag:#         choice2=input(‘>>:‘).strip()#         if choice2.upper()==‘Q‘:#             break#         if choice2.upper()==‘B‘:#             flag=False#             break#         next2=next1[choice2]#         for z in next2:#             print(z)#         choice3 = input(‘>>:‘).strip()#         if choice3.upper()==‘Q‘:#             flag=False#             break#         if choice3.upper()==‘B‘:#             continueexit_flag = Falsewhile not exit_flag:    for key in dic:        print(key)    choice = input(">:").strip()    if len(choice) == 0 : continue    if choice == ‘q‘:        exit_flag = True        continue    if choice in dic: #省存在，进入此省下一级        while not exit_flag:            next_layer = dic[choice]            for key2 in next_layer:                print(key2)            choice2 = input(">>:").strip()            if len(choice2) == 0: continue            if choice2 == ‘b‘: break            if choice2 == ‘q‘:                exit_flag = True                continue            if choice2 in next_layer: #再进入下一层                while not exit_flag:                    next_layer2 = next_layer[choice2]                    for key3 in next_layer2:                        print(key3)                    choice3 = input(">>>:").strip()                    if len(choice3) == 0: continue                    if choice3 == ‘b‘: break                    if choice3 == ‘q‘:                        exit_flag = True                        continue                    if choice3 in next_layer2:                        while not exit_flag:                            next_layer3 = next_layer2[choice3]                            for key4 in next_layer3:                                print(key4)                            choice4 = input(">>>>:").strip()                            if choice4 == ‘b‘:break                            if choice4 == ‘q‘:                                exit_flag = True                                continue# 第二种# current_layer=dic# layers=[dic]# while True:#     for i in current_layer:#         print(i)#     choice=input(‘>>>:‘).strip()#用户输入选项#     #判断输入是否有效#     if choice in current_layer:#         layers.append(current_layer)#把当前层菜单添加到全部层，用于返回上一级使用#         current_layer=current_layer[choice]#把当前层替换新的#     elif choice.upper()==‘B‘:#         current_layer=layers[-1]#         layers.pop()#     elif choice.upper()==‘Q‘:#         break