Postgresql function plpython select json value -

i'm using postgresql 9.6. build function "selec"t :

id = td["new"]["id"] qry = plpy.prepare ("select (decode->>'key')::integer key table id = $1;", ["int"]) res= plpy.execute(qry,[id]) 

the request work fine, result hold key , value, not value. in fact, result : {"key":2937}

i want value.

the result object emulates list or dictionary object. result object can accessed row number , column name.

create or replace function pf() returns integer $$      query = 'select 1 key'     rs = plpy.execute(query)     plpy.notice(rs.__str__())     return rs[0]['key']  $$ language plpythonu;  select pf();                                                                                   notice:  <plyresult status=5 nrows=1 rows=[{'key': 1}]>  pf  ----   1 

https://www.postgresql.org/docs/current/static/plpython-database.html