PostgreSQL: how to install plpythonu extension

Question

I'm running PostgreSQL 9.3.1 on Ubuntu 12.04.4. I'd like to use the plpython language extension but I get an error when I try to use it I get:

ERROR: language "plpythonu" does not exist

When I try to create the extension:

CREATE EXTENSION plpythonu

I get ERROR: could not access file "$libdir/plpython2": No such file or directory After much searching and digging through blog posts, I've tried installing additional packages, and have copied all the plpython files from /usr/share/postgresql/9.1/extension to /opt/bitnami/postgresql/share/extension where PostgreSQL seems to be looking for them. That at least got me to a point at which PostgreSQL actually sees the available extensions. When I run:

SELECT name, default_version, installed_version FROM pg_available_extensions WHERE name LIKE('plpy*')

I get :

    name    | default_version | installed_version 
------------+-----------------+-------------------
 plpython2u | 1.0             | 
 plpython3u | 1.0             | 
 plpythonu  | 1.0             | 

There are still no plpython libraries that I can see in /opt/bitnami/postgresql/lib. Can anybody help me get through remaining steps to make the extension work? Thanks in advance!

Answer 1

You're using a PostgreSQL package from Bitnami, in /opt. It's not clear if you installed this with apt-get or via an installer script/program, but in either case it's not the same PostgreSQL as what's in the Ubuntu postgresql package.

Installing postgresql-plpython won't do you any good, because you're installing PL/Python support for a different PostgreSQL install than the one you're actually using.

You'll need to use the same installation method you originally used to install the Bitnami PostgreSQL to add PL/Python support, if it's available. It might not be provided by Bitnami.

Otherwise, if you're not too attached to using Bitnami's PostgreSQL, you could use the recommended packages from http://apt.postgresql.org/ .

Answer 2

for postgres 11.2 (Debian based) I needed to install:

apt-get update && apt-get install postgresql-plpython3-11

Answer 3

I'm running Raspbian 10 (buster) / Linux raspberrypi 4.19.97-v7+ #1294 and ran the following commands to install PL/Python 3 on PostgreSQL 11.7.

1. Identify which versions are available for install:

pi@raspberrypi:~/$ sudo apt-cache search ".*plpython3.*"
postgresql-plpython3-11 - PL/Python 3 procedural language for PostgreSQL 11

2. sudo apt-get install postgresql-contrib postgresql-plpython3-11

3. sudo systemctl start postgresql (or use enable to start this at every startup, see Getting started with PostgreSQL on Linux) on stand-alone Linux or sudo service postgresql start (on WSL2).

Else, you would get the error:

psql: error: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

4. sudo su - postgres

5. psql

6. CREATE EXTENSION plpython3u;

7. Verify with command:

select * from pg_language;