how to returns set of records in PL/python

Hi ,

Iam new to plpython,how can I return a recordset from a plpython
function?

Is there is any way give me an example;

plpgsql function
--------------------------------

CREATE OR REPLACE FUNCTION function_to_get_all_countries() RETURNS SETOF
RECORD AS $BODY$
DECLARE

r RECORD;

BEGIN

FOR r IN SELECT pk_bint_country_id,vchr_country FROM tbl_country LOOP
RETURN NEXT r;
END LOOP;
RETURN;

END
$BODY$ LANGUAGE 'plpgsql';

How i can get the same result using plpythonu and how I can call the
function (is there any user defined type required like in plpgsql)?

Thanks in advance

Anoop