1 #author F
2
3 #字典基本操作
4 info = {
5 'stu1101':'Mr F',
6 'stu1102':'miss l00 ',
7 'stu1103':'dr key'
8 }
9 print(info) #字典是无序的
10 #查询
11 print(info["stu1102"])
12 #修改
13 info["stu1101"] = "aobama"
14 print(info)
15 #增加
16 info["stu1104"] = "Cort"
17 print(info)
18 #删除
19 del info["stu1103"] #删除指定
20 info.pop("stu1102") #删除指定
21 info.popitem() #随便删除
22 #查询
23 dist = {
24 "1":"asd1asd",
25 "2":"asda2sd",
26 "3":"asdas3d",
27 "4":"asd4asd",
28 "5":"as5dasd",
29 "6":"asd6asd",
30 "7":"asda7sd",
31 "8":"asdas8d"
32 }
33 # info['9'] #字典中不存在时报错 KeyError错误
34 print(dist.get("3")) #有就返回 没有返回null
35 print('5' in dist) #查找字典中是否存在某个key
36
37 #多级字典嵌套及操作
38
39 category = {
40 "oumei":{
41 "yourporn":["henduomianfei", "zhiliangyiban"],
42 "pornhub":["henduomianfei", "zhiliangjiaogao"],
43 "letmedothistoyou":["duoshizipai", "ziyuanbuduo"],
44 "x-art":["zhilianghengao", "quanbushoufei"]
45 },
46 "rihan":{
47 "tokyohot":["buzhidao","nizijikan"]
48 },
49 "dalu":{
50 "1024":["quanbumianfei","suduman"]
51 }
52 }
53 category["dalu"]["1024"] = "keyizaiguoneizuojingxiang"
54 category.setdefault("taiwan", {"www.baidu.com":[1,2]}) #先去字典中找 找到则返回 找不到则创建新值
55
56 print(category)
57
58 #
59 b = {
60 "teacher1": "1cool",
61 "stu1102": "2cool",
62 "teacher3": "3cool"
63 }
64 info.update(b) #字典合并 有则改 无则加
65 print(info)
66
67 print(info.items()) #字典转成列表
68
69 c = dict.fromkeys([6, 7, 8], "test") #初始化一个新的字典
70 print(c) #{6: 'test', 7: 'test', 8: 'test'}
71 #坑
72 c = dict.fromkeys([6, 7, 8], [1, {"name":"aobama"}, 444]) #fromkeys填入的是内存地址 所以导致全部修改
73 c[7][1]["name"] = "changed_name"
74 print(c) #{6: [1, {'name': 'changed_name'}, 444], 7: [1, {'name': 'changed_name'}, 444], 8: [1, {'name': 'changed_name'}, 444]}
75
76 #字典的循环
77 for i in info: #高效
78 print(i, info[i])
79
80 for k, v in info.items(): #字典转成列表的过程导致低效
81 print(k, v)
