From a python module, called from a pl/python function, how to get the return value?

Question

Is there any reason this function call would not return 'result'?

CREATE OR REPLACE FUNCTION myfunction (input int, OUT result int) AS $$

result = mymodule.object(input,plpy)
plpy.info(" ========= EXTRA-module result: ===",result)

$$ LANGUAGE plpythonu;

=== Content of mymodule ============

def object(input,plpy):
  import StringIO
  try:
   plan = plpy.prepare("INSERT INTO file VALUES (nextval('primary_sequence'),$1) RETURNING primary_key", ["integer"] )
  except:
   plpy.error(traceback.format_exc())

  try:
   rv = plpy.execute(plan, [ input ])
   result = rv[0]["primary_key"]
   plpy.info(" ========= INTRA-module result: ===",result)
   return result
  except:
   plpy.error(traceback.format_exc())

Answer 1

@ed. Didn't actually need the RETURNS syntax instead of OUT, but your suggestion put me onto the answer. And yes, I feel like a real dummy. This is the beauty of having others review one's work.

with the return result added, things work out nicely. Key assumption I'd made here was that the result = syntax did not actually finish the return within the scope of the calling function. Doh!

CREATE OR REPLACE FUNCTION myfunction (input int, OUT result int) AS $$

result = mymodule.object(input,plpy)
plpy.info(" ========= EXTRA-module result: ===",result)
# This was the key bit:
return result

$$ LANGUAGE plpythonu;