python 3.x - How do I combine the object produced by selecting a JSON column into a JSON object proper? -

using psycopg , built-in json library, have python code looks this:

cur = connection.cursor() cur.execute('select * my_postgresql_table;') records = cur.fetchall() cur.close()  record in records:   my_json_column, other_column = record   dict_for_json = { starting_information: other_column }   json_i_want = json.dumps(some magical code combines dict_for_json , my_json_column 1 big dictionary)    do_what_i_ultimately_want_to_do(json_i_want) 

what want "magical" line? think want take value psycopg gives me when retreives json-types column, convert dictionary, , merge dictionary created. can json.dumps() final dictionary json object proper.

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i understand can use .update() merge 2 dictionaries (how merge 2 dictionaries in single expression?). , according psycopg docs,

reading database, json , jsonb values automatically converted python objects.

so think able convert my_json_column dictionary usual way, update dict_for_json. when try that:

json_i_want = json.dumps(dict_for_json.update(my_json_column.__dict__)) 

i error:

    json_i_want = json.dumps(dict_for_json.update(my_json_column.__dict__)) attributeerror: 'dict' object has no attribute '__dict__' 

what should doing merge 2 dictionaries?

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to clear, when want merge 2 dictionaries, mean want new dictionary has of key-value pairs both existing dictionaries. if existing dictionaries both share key different values, doesn't matter me value clobbered in merge in situation i'm working with.