DO $$ plpy.notice("This is plpythonu.") $$ LANGUAGE plpythonu;
NOTICE:  This is plpythonu.
CONTEXT:  PL/Python anonymous code block
DO $$ nonsense $$ LANGUAGE plpythonu;
ERROR:  PL/Python: NameError: global name 'nonsense' is not defined
CONTEXT:  PL/Python anonymous code block