listing users with access to code in the database (procedures triggers packages functions....)

I have been asked to provide a list of individual that have access to run or change code in the database.  

The two queries below look quite complex for answering such a simple question. 

Am I heading in the wrong direction on the below queries?

 

#################################################################

##    user with access to code through a role

#################################################################

SELECT DISTINCT NN.USERNAME, MM.GRANTED_ROLE, OO.OBJECT_TYPE, OO.OBJECT_NAME, OO.PATH

  FROM DBA_ROLE_PRIVS MM

     , DBA_USERS NN

     , (

 SELECT DISTINCT SS.GRANTEE FN_ROLE, SS.OBJECT_TYPE, SS.OWNER, SS.OBJECT_NAME

     , RR.GRANTEE, RR. GRANTED_ROLE , RR.PATH

  FROM

         (SELECT grantee,  granted_role, sys_connect_by_path(granted_role,'/') path