How to dynamically build a JSON object with Python

Question

I am new to Python and I am playing with JSON data  I would like to dynamically build a JSON object by adding some key-value to an existing JSON object   I tried the following but I get TypeError   str  object does not support item assignment   import json  json data   json dumps     json data  key      value   print  JSON     json data

User · Accepted Answer

You build the object before encoding it to a JSON string   import json  data      data  key      value  json data   json dumps data    JSON is a serialization format  textual data representing a structure  It is not  itself  that structure

User · Answer

You can use EasyDict library  doc    EasyDict allows to access dict values as attributes  works recursively   A Javascript-like properties dot notation for python dicts  USEAGE  gt  gt  gt  from easydict import EasyDict as edict  gt  gt  gt  d   edict   foo  3   bar    x  1   y  2     gt  gt  gt  d foo 3  gt  gt  gt  d bar x 1   gt  gt  gt  d   edict foo 3   gt  gt  gt  d foo 3     INSTALLATION    pip install easydict

User · Answer

There is already a solution provided which allows building a dictionary   or nested dictionary for more complex data   but if you wish to build an object  then perhaps try  ObjDict    This gives much more control over the json to be created  for example retaining order  and allows building as an object which may be a preferred representation of your concept   pip install objdict first   from objdict import ObjDict  data   ObjDict   data key    value  json data   data dumps

User · Answer

myjson      myjson  quot Country quot      quot KR quot      quot id quot    quot 220 quot    quot name quot    quot South Korea quot      myjson  quot Creative quot                           quot 1067405 quot                              quot id quot    quot 1067405 quot                            quot url quot    quot https   cdn gowadogo com 559d1ba1-8d50-4c7f-b3f5-d80f918006e0 jpg quot                                              quot 1067406 quot                              quot id quot    quot 1067406 quot                            quot url quot    quot https   cdn gowadogo com 3799a70d-339c-4ecb-bc1f-a959dde675b8 jpg quot                                              quot 1067407 quot                              quot id quot    quot 1067407 quot                            quot url quot    quot https   cdn gowadogo com 180af6a5-251d-4aa9-9cd9-51b2fc77d0c6 jpg quot                                             myjson  quot Offer quot                           quot advanced targeting enabled quot    quot f quot                        quot category name quot    quot E-commerce  Shopping quot                        quot click lifespan quot    quot 168 quot                        quot conversion cap quot    quot 50 quot                        quot currency quot    quot USD quot                        quot default payout quot    quot 1 5 quot                        json data   json dumps myjson       reverse back into a json     paths       def walk the tree inputDict suffix None          for key  value in inputDict items                if isinstance value  dict                   if suffix  None                      suffix key                 else                      suffix   quot   quot  key                  walk the tree value suffix              else                  paths append suffix  quot   quot  key  quot   quot  value   walk the tree myjson   print paths       split and build your nested dictionary  json specs       for path in paths       parts path split           value  parts -1        d json specs      for p in parts  -1            if p  parts -2                d   d setdefault p value           else               d   d setdefault p           print json specs            Paths     Country KR id 220    Country KR name South Korea    Country Creative 1067405 id 1067405    Country Creative 1067405 url https   cdn gowadogo com 559d1ba1-8d50-4c7f-b3f5-d80f918006e0 jpg    Country Creative 1067405 1067406 id 1067406    Country Creative 1067405 1067406 url https   cdn gowadogo com 3799a70d-339c-4ecb-bc1f-a959dde675b8 jpg    Country Creative 1067405 1067406 1067407 id 1067407    Country Creative 1067405 1067406 1067407 url https   cdn gowadogo com 180af6a5-251d-4aa9-9cd9-51b2fc77d0c6 jpg    Country Creative Offer advanced targeting enabled f    Country Creative Offer category name E-commerce  Shopping    Country Creative Offer click lifespan 168    Country Creative Offer conversion cap 50    Country Creative Offer currency USD    Country Creative Offer default payout 1 5

User · Answer

You can create the Python dictionary and serialize it to JSON in one line and it s not even ugly   my json string   json dumps   key1   val1   key2   val2

User · Answer

json loads take a string as input and returns a dictionary as output  json dumps take a dictionary as input and returns a string as output   If you need to convert JSON data into a python object  it can do so with Python3  in one line without additional installations  using SimpleNamespace and object hook  from string import json from types import SimpleNamespace  string      quot foo quot  3   quot bar quot    quot x quot  1   quot y quot  2       Parse JSON into an object with attributes corresponding to dict keys  x   json loads string  object hook lambda d  SimpleNamespace   d    print x foo  print x bar x  print x bar y   output  3 1 2  from file  JSON object  data json        quot foo quot   3       quot bar quot              quot x quot   1           quot y quot   2          import json from types import SimpleNamespace  with open  quot data json quot   as fh      string   fh read      Parse JSON into an object with attributes corresponding to dict keys  x   json loads string  object hook lambda d  SimpleNamespace   d    print x foo  print x bar x  print x bar y   output  3 1 2  from requests import json from types import SimpleNamespace import requests  r   requests get  https   api github com users MilovanTomasevic      Parse JSON into an object with attributes corresponding to dict keys  x   json loads r text  object hook lambda d  SimpleNamespace   d    print x name  print x company  print x blog   output  Milovan Toma  evic NLB milovantomasevic com  For more beautiful and faster access to JSON response from API  take a look at this response

User · Answer

All previous answers are correct  here is one more and easy way to do it  For example  create a Dict data structure to serialize and deserialize an object   Notice None is Null in python and I m intentionally using this to demonstrate how you can store null and convert it to json null   import json print  serialization   myDictObj      name   John    age  30   car  None     convert object to json serialized  json dumps myDictObj  sort keys True  indent 3  print serialized     now we are gonna convert json to object deserialization json loads serialized  print deserialization

[python] How to dynamically build a JSON object with Python?

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