-- first some tests of basic functionality
CREATE EXTENSION plpython2u;
-- really stupid function just to get the module loaded
CREATE FUNCTION stupid() RETURNS text AS 'return "zarkon"' LANGUAGE plpythonu;
select stupid();
 stupid 
--------
 zarkon
(1 row)

-- check 2/3 versioning
CREATE FUNCTION stupidn() RETURNS text AS 'return "zarkon"' LANGUAGE plpython2u;
select stupidn();
 stupidn 
---------
 zarkon
(1 row)

-- test multiple arguments
CREATE FUNCTION argument_test_one(u users, a1 text, a2 text) RETURNS text
	AS
'keys = list(u.keys())
keys.sort()
out = []
for key in keys:
    out.append("%s: %s" % (key, u[key]))
words = a1 + " " + a2 + " => {" + ", ".join(out) + "}"
return words'
	LANGUAGE plpythonu;
select argument_test_one(users, fname, lname) from users where lname = 'doe' order by 1;
                           argument_test_one                           
-----------------------------------------------------------------------
 jane doe => {fname: jane, lname: doe, userid: 1, username: j_doe}
 john doe => {fname: john, lname: doe, userid: 2, username: johnd}
 willem doe => {fname: willem, lname: doe, userid: 3, username: w_doe}
(3 rows)

-- check module contents
CREATE FUNCTION module_contents() RETURNS text AS
$$
contents = list(filter(lambda x: not x.startswith("__"), dir(plpy)))
contents.sort()
return ", ".join(contents)
$$ LANGUAGE plpythonu;
select module_contents();
                                                                           module_contents                                                                            
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Error, Fatal, SPIError, debug, error, execute, fatal, info, log, notice, prepare, quote_ident, quote_literal, quote_nullable, spiexceptions, subtransaction, warning
(1 row)

CREATE FUNCTION elog_test() RETURNS void
AS $$
plpy.debug('debug')
plpy.log('log')
plpy.info('info')
plpy.info(37)
plpy.info()
plpy.info('info', 37, [1, 2, 3])
plpy.notice('notice')
plpy.warning('warning')
plpy.error('error')
$$ LANGUAGE plpythonu;
SELECT elog_test();
INFO:  info
CONTEXT:  PL/Python function "elog_test"
INFO:  37
CONTEXT:  PL/Python function "elog_test"
INFO:  ()
CONTEXT:  PL/Python function "elog_test"
INFO:  ('info', 37, [1, 2, 3])
CONTEXT:  PL/Python function "elog_test"
NOTICE:  notice
CONTEXT:  PL/Python function "elog_test"
WARNING:  warning
CONTEXT:  PL/Python function "elog_test"
ERROR:  plpy.Error: error
CONTEXT:  Traceback (most recent call last):
  PL/Python function "elog_test", line 10, in <module>
    plpy.error('error')
PL/Python function "elog_test"