Andrei Pozolotin <andrei(dot)pozolotin(at)gmail(dot)com> writes:
> 1. any attempt to define python function as an event_trigger, i.e.:
AFAICS, there's not really any event trigger support in plpython.
That feature has only been built out in the other three PLs.
Somebody oughta fix this sometime, I guess, but it evidently hasn't
been high priority. If you feel like working on it, you could look
at commits e5dc4cc24d2e1e94ac572a2c64103710bf15d21e (for plperl)
and/or a5036ca998a6058f60913d43a80badfcbb65f5bb (for pltcl).
regards, tom lane