关于python：如何向嵌套字典添加新对象？

How to add new objects to nested dictionary?

考虑到下面的对象，如何在"加利福尼亚"中添加一个新城市"洛杉矶"？给定城市的国家、州、市和属性，如何更新对象？(我对Python很陌生)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27

myplaces = {
"unitedstates": {
"california": {
"sanfrancisco": {
"description":"Tech heaven",
"population": 1234,
"keyplaces": ["someplace1",
"someplace2"]
}
}
},
"india": {
"karnataka": {
"bangalore": {
"description":"IT hub of India",
"population": 12345,
"keyplaces": ["jpnagar",
"brigade"]
},
"mysore": {
"description":"hostoric place",
"population": 12345,
"keyplaces": ["mysorepalace"]
}
}
}
}

我尝试如下添加元素(比如如何在PHP中完成)：

1	myplaces['unitedstates']['california']['losangeles']['description'] = 'Entertainment'

编辑：这不是副本。我正在寻找添加项目的通用方法。

相关讨论

可以使用默认值为树的字典创建树：

1
2
3
4
5
6
7
8

>>> from collections import defaultdict

>>> def tree():
... return defaultdict(tree)

>>> myplaces = tree()
>>> myplaces['unitedstates']['california']['losangeles']['description'] = 'Entertainment'

尝试：

1 2	myplaces['unitedstates']['california']['losangeles']={} myplaces['unitedstates']['california']['losangeles']['description']='Entertainment'