creating df to generate json in the given format

Question

I am trying to generate a df to produce this below json.

Json data:

{
 \"name\": \"flare\",
 \"children\":  [
    {
     \"name\": \"K1\",
     \"chi         


        

Answer 1

You need reshape data by set_index + stack and then use groupby with apply for nested list of dict:

import json

df = (df.set_index('name')
        .stack()
        .reset_index(level=1)
        .rename(columns={'level_1':'name', 0:'size'})
        .groupby(level=0).apply(lambda x: x.to_dict(orient='records'))
        .reset_index(name='children')
        )

print (df)
  name                                           children
0   K1  [{'name': 'Exact', 'size': 4}, {'name': 'synon...
1   K2  [{'name': 'Exact', 'size': 10}, {'name': 'syno...
2   K3  [{'name': 'Exact', 'size': 0}, {'name': 'synon...
3   K4  [{'name': 'Exact', 'size': 13}, {'name': 'syno...
4   K5  [{'name': 'Exact', 'size': 0}, {'name': 'synon...

#convert output to dict
j = { "name": "flare", "children":  df.to_dict(orient='records')}

---

#for nice output - easier check
import pprint 
pp = pprint.PrettyPrinter(indent=4)
pp.pprint(j)
{   'children': [   {   'children': [   {'name': 'Exact', 'size': 4},
                                        {'name': 'synonyms', 'size': 14}],
                        'name': 'K1'},
                    {   'children': [   {'name': 'Exact', 'size': 10},
                                        {'name': 'synonyms', 'size': 20}],
                        'name': 'K2'},
                    {   'children': [   {'name': 'Exact', 'size': 0},
                                        {'name': 'synonyms', 'size': 5}],
                        'name': 'K3'},
                    {   'children': [   {'name': 'Exact', 'size': 13},
                                        {'name': 'synonyms', 'size': 15}],
                        'name': 'K4'},
                    {   'children': [   {'name': 'Exact', 'size': 0},
                                        {'name': 'synonyms', 'size': 0}],
                        'name': 'K5'}],
    'name': 'flare'}

---

#convert data to json and write to file
with open('data.json', 'w') as outfile:
    json.dump(j, outfile)