Utilities|Automation Designer … new (right click).
Then next screen:
Sample output looks like (in c:\temp directory):
begin
my_pkg.py_proc ();
End;
Error at line 1
ORA-06550: line 2, column 3:
PLS-00201: identifier ‘MY_PKG.PY_PROC’ must be declared
ORA-06550: line 2, column 3:
PL/SQL: Statement ignored