Question

鉴于以下对象，如何在“加利福尼亚”中添加新城市“losangeles”？给定城市的国家，州，城市和属性，我该如何更新对象？（我对python很新）

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"]
      }
    }
  }
}

我尝试添加如下元素（就像在PHP中完成的那样）：

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

编辑：这不是重复的。我正在寻找一种添加项目的通用方法。

Answer 1

你几乎得到了它 -

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

Answer 2

您可以使用具有默认值树的字典创建树：

>>> from collections import defaultdict

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


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

Answer 3

尝试：

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

如何将新对象添加到嵌套字典？

3 个答案: