Python Json访问

Question

我有如下Json数据：

{
 "context":[ 
            {   
             "local": 
                    [
                      {
                       "interface": "BDI200",
                       "desc":"eNODEB",
                      },

                       {
                      "interface": "BDI100",
                      "desc":"eNODEB",
                      }
                   ]

                 },

            {
               "CPM": [
                       {

                       "interface": "BDI200",
                       "desc":"eNODEB",
                       },

                      {
                       "interface": "BDI100",
                       "desc":"eNODEB",
                       }
                 ]
         }
   ]
}

实际上在“context”中，我有两个context“local”和“CPM”。要访问上下文的元素，我必须静态地指定上下文的名称（例如下面的代码）。在现实生活中，我有50多个上下文，那么我如何访问不提供姓名

import json


a=open('4.txt','r')
data=json.load(a)
print (data['context'][0]['local'])

Answer 1

在您的案例中，上下文是一个数组，因此您可以简单地对其进行迭代：

for cntxt in data["context"]:
    print(cntxt)

如果您对json结构拥有控制权，则可以通过以下方式进行更改：

{
    "context":
    {   
        "local": [
            {
                "interface": "BDI200",
                "desc":"eNODEB",
            },
            {
                "interface": "BDI100",
                "desc":"eNODEB",
            }
        ],

        "CPM": [
            {
                "interface": "BDI200",
                "desc":"eNODEB",
            },
            {
                "interface": "BDI100",
                "desc":"eNODEB",
            }
        ]
    }
}

更明确地重复：

for name, context_data in a["context"].items():
    print("Context's name:", name)
    print("Data:", context_data)

Answer 2

首先，你的json是无效的

我用下面讨论的那个做了一个有效的json

{
 "context":[ 
            {   
             "local": 
                    [
                      {
                       "interface": "BDI200",
                       "desc":"eNODEB"
                      },

                       {
                        "interface": "BDI100",
                        "desc":"eNODEB"
                      }
                   ]

                 },

            {
               "CPM": [
                       {

                       "interface": "BDI200",
                       "desc":"eNODEB"
                       },

                      {
                       "interface": "BDI100",
                       "desc":"eNODEB"
                       }
                 ]
         }
   ]
}

如果你想迭代这个json，得到所有的local，CPM等等，试试这个

import json


a=open('4.txt','r')
data=json.load(a)
for k in data:
    for j in data[k]:
        d = j
        for l in d:
            print(l)
            print(d[l])