script to grant read/write access to user from all Db users in oracle database?

Here is the script which I used to pull all the grants and push to ROLE.
then grant to role to user.

select 'grant select ,update,insert,delete on '||owner||'.'||view_name||' to RW_ROLE;' from dba_views where owner in (select username from dba_users where username not in ('SYSTEM','DBSNMP','SYS','OUTLN','OLAPSYS','CTXSYS','EM_MONITOR','SYSMAN') );

select 'grant select ,update,insert,delete on '||owner||'.'||table_name||' to RW_ROLE;' from dba_tables where owner in (select username from dba_users where username not in ('SYSTEM','DBSNMP','SYS','OUTLN','OLAPSYS','CTXSYS','EM_MONITOR','SYSMAN') );