1 # 增
2 dic = {"name":"周杰伦","age":45,"sex":"boy","money":100000}
3 dic["sex"] = "女"  #增加,如果key重复了,会替换掉原来的value
4 print(dic)
5 dic.setdefault("hobby","listen music")
6 print(dic)

 1 # 删
 2 dic = {"name":"周杰伦","age":45,"sex":"boy","money":100000}
 3 ret = dic.pop("money")    #有返回值,返回的是被删除的value
 4 print(dic)              #{'name': '周杰伦', 'age': 45, 'sex': 'boy'}
 5 print(ret)      #被删除的值
 6 del dic["sex"]    #{'name': '周杰伦', 'age': 45, 'money': 100000}
 7 print(dic)
 8 dic.popitem()       #随机删除
 9 print(dic)          #{'name': '周杰伦', 'age': 45, 'sex': 'boy'}
10 dic.clear()         #全部清空 {}
11 print(dic)

1 #改
2 dic = {"name":"周杰伦","age":45,"sex":"boy","money":100000}
3 dic["age"] = "40"   #强制修改值
4 print(dic)      #{'name': '周杰伦', 'age': '40', 'sex': 'boy', 'money': 100000}
5 dic1 = {"name":"李晨","bug":"唯一一个","age":38}
6 dic2 = {"name":"范冰冰","邓超":"玛丽","age":26}
7 dic2.update(dic1)       #把dic1中的内容更新到dic2中,如果存在了key,则替换,如果不存在,则添加进去
8 print(dic1)
9 print(dic2)

 1#查 2 dic = {"name":"周杰伦","age":45,"sex":"boy","money":100000}
 3 print(dic.get("sex"))       #boy
 4 print(dic["age"])           #45
 5 for a in dic:           #for 循环默认是获取字典中的键(key)
 6     print(a)
 7     print(dic[a])       #获取的是字典中的值(value)
 8 ret = dic.setdefault("name","谢文东")    #首先判断原来的字典中有没有这个key,如果没有,执行新增
 9 print(dic)                          #用这个key去字典中查询,返回查找到的结果
10 print(ret)

1 dic = {"name":"周杰伦","age":45,"sex":"boy","money":100000}
2 print(dic.keys())       #获取到所有的键存在一个高仿的列表中
3 ##dict_keys(['name', 'age', 'sex', 'money'])
4 print(dic.values())       #获取到所有的值存在一个高仿的列表中
5 ##dict_values(['周杰伦', 45, 'boy', 100000])
6 print(dic.items())         #获取到所有的键值对,以元组的形式存在一个高仿的列表中
7 ##dict_items([('name', '周杰伦'), ('age', 45), ('sex', 'boy'), ('money', 100000)])

 1 # 字典的嵌套
 2 dic1 = {
 3     "name":"汪峰",
 4     "age":48,
 5     "sex":"男",
 6     "wife":{
 7         "name":"章子怡",
 8         "age":36,
 9         "sex":"女",
10     },
11     "baby":[
12         {"name":"熊大","age":18},
13         {"name":"熊二","age":16}
14     ]
15 }
16 print(dic1)
17 dic1["baby"][1]["age"] = 14
18 print(dic1)