I am working on debian jessie
I have installed the language :
aptitude install postgresql-plpython3
then :
% createlang plpython3u template1
then :
% psql
postgres=# CREATE LANGUAGE plpython3u;
I have tried this function :
Create or replace function test() returns void as $$
print('Bonjour le monde')
$$ language plpython3u;
I have tried to force the db :
createlang plpython3u db_test
And i get the message, it is already installed, so I don't know what to do more ??