1 #!/usr/bin/python
 2 # -*- coding:utf-8 -*-
 3 # a.元素分类
 4 v1 = [11,22,33,44,55,66,77,88,99,90]
 5 v2 = {‘k1‘:[],‘k2‘:[]}
 6 for i in v1:
 7     if i < 66:
 8         v2[‘k1‘].append(i)
 9     else:
10         v2[‘k2‘].append(i)
11 print(v2)

 1 #!/usr/bin/python
 2 # -*- coding:utf-8 -*-
 3 goods = [
 4     {"name": "电脑", "price": 1999},
 5     {"name": "鼠标", "price": 10},
 6     {"name": "游艇", "price": 20},
 7     {"name": "美女", "price": 998},
 8 ]
 9 salary = input(‘总资产：‘)
10 list = []
11 shopping_cart = []
12 if salary.isnumeric():
13     salary = int(salary)
14     for i in goods:
15         item = []
16         item.append(i[‘name‘])
17         item.append(i[‘price‘])
18         list.append(item)
19     # for x in list:                # 此方法与下面的方法输出结果一致
20     #     print(list.index(x),x)
21     print(‘----- 商品列表 ------‘)
22     for index,goods_list in enumerate(list):
23         print(index,goods_list)
24     while True:
25         choice_id = input(‘选择商品或退出（q）：‘)
26         if choice_id.isdigit():
27             choice_id = int(choice_id)
28             if choice_id < len(list):
29                 if salary >= list[choice_id][1]:
30                     shopping_cart.append(list[choice_id])
31                     salary -= list[choice_id][1]
32                     print(‘已添加 "%s" 至购物车,余额：\033[31;1m%s\033[0m‘% (list[choice_id][0],salary))
33                 else:
34                     print(‘余额不足‘)
35             else:
36                 print(‘商品不存在‘)
37         elif choice_id == ‘q‘:
38             print(‘余额：\033[31;1m%s\033[0m, 已购买的商品：‘% salary)
39             for id, al_shop in enumerate(shopping_cart):
40                 print(id, al_shop)
41             exit(‘退出‘)
42         else:
43             print(‘Invalid option‘)
44 else:
45     print(‘输入无效‘)

 1 #!/usr/bin/python
 2 # -*- coding:utf-8 -*-
 3 
 4 # c.用户交互，显示省市县三级联动的选择
 5 dic = {
 6     ‘河北‘:{
 7         ‘石家庄‘:[‘鹿泉‘,‘藁城‘,‘元氏‘],
 8         ‘邯郸‘:[‘永年‘,‘涉县‘,‘磁县‘],
 9     },
10     ‘湖北‘:{
11         ‘十堰‘:[‘茅箭‘,‘郧西‘,‘张湾‘],
12         ‘襄阳‘:[‘襄城‘,‘樊城‘,‘南鄣‘],
13     },
14     ‘北京‘:{
15         ‘朝阳‘:[‘北苑‘,‘大屯‘,‘奥运村‘],
16         ‘昌平‘:[‘回龙观‘,‘天通苑‘,‘立水桥‘],
17     },
18 }
19 
20 while True:
21     print(‘-------- 省列表 -------‘)
22     for province in dic:
23         print(province)
24     prov = input(‘请输入省，q 退出：‘)
25     if prov in dic:
26         while True:
27             print(‘-------- 市列表 --------‘)
28             for city_list in dic[prov].keys():
29                 print(‘\t‘,city_list)
30             choice_city = input(‘请选择市，b 返回：‘)
31             if choice_city in dic[prov].keys():
32                 print(‘------- 县列表 -------‘)
33                 while True:
34                     for county_list in dic[prov][choice_city]:
35                         print(‘\t\t‘,county_list)
36                     choice_county = input(‘请选择县, b 返回：‘)
37                     if choice_county in dic[prov][choice_city]:
38                         print(‘您选择的是：%s省，%s市，%s县‘% (prov,choice_city,choice_county))
39                         quit = input(‘您还想继续吗？q 退出，b 返回,其它键继续：‘)
40                         if quit == ‘q‘:
41                             exit(‘不玩了‘)
42                         elif quit == ‘b‘:
43                             break
44                     elif choice_county == ‘b‘:
45                         break
46                     else:
47                         print(‘您选择的县不存在‘)
48                     #break
49             elif choice_city == ‘b‘:
50                 break
51             else:
52                 print(‘您选择的市不存在‘)
53             #break
54     elif prov == ‘q‘:
55         print(‘===== 退出系统 =====‘)
56         break
57     else:
58         print(‘您输入的省不存在‘)