how to create a dataframe to generate json in the given format

问题

I need to generate a json from my dataframe but I have tried many formats of df but still I am not able get the required json format.

My required json format is,

[
    {
        "Keyword": "Red", 
        "values": [
            {
                "value": 5, 
                "TC": "Color"
            }            
        ]
    }, 
     {
        "Keyword": "Orange", 
        "values": [
            {
                "value": 5, 
                "TC": "Color"
            }            
        ]
    }, 
     {
        "Keyword": "Violet", 
        "values": [
            {
                "value": 5, 
                "TC": "Color"
            }            
        ]
    }
]

I want a df to generate this json. Please help.

but currently im getting df.to_json:

 {"Names":{"0":"Ram","1":"pechi","2":"Sunil","3":" Ravi","4":"sri"},"Values":{"0":"[{'value':2,'TC': 'TC Count'}]","1":"[{'value':2,'TC': 'TC Count'}]","2":"[{'value':1,'TC': 'TC Count'}]","3":"[{'value':1,'TC': 'TC Count'}]","4":"[{'value':1,'TC': 'TC Count'}]"}}  

回答1:

I think you need:

• set_index for columns not in nested dictionaries
• create dicts by apply with to_dict
• reset_index for column from index
• create json by to_json

---

print (df)

  Keyword     TC  value
0     Red  Color      5
1  Orange  Color      5
2  Violet  Color      5

j = (df.set_index('Keyword')
        .apply(lambda x: [x.to_dict()], axis=1)
        .reset_index(name='values')
        .to_json(orient='records'))
print (j)

[{"Keyword":"Red","values":[{"TC":"Color","value":5}]},
 {"Keyword":"Orange","values":[{"TC":"Color","value":5}]},
 {"Keyword":"Violet","values":[{"TC":"Color","value":5}]}]

For write to file:

(df.set_index('Keyword')
   .apply(lambda x: [x.to_dict()], axis=1)
   .reset_index(name='values')
   .to_json('myfile.json', orient='records'))

来源：https://stackoverflow.com/questions/47012242/how-to-create-a-dataframe-to-generate-json-in-the-given-format