Postgres.app

The easiest way to get started with PostgreSQL on the Mac

PL/Python

If you want to write stored procedures or functions in Python, you have to use PL/Python.

PostgreSQL 13

Starting with PostgreSQL 13, Postgres.app includes the plpython3u extension. This extension allows you to create functions and stored procedures in Python 3. However, Postgres.app does not include the Python programming language itself. You need to download the official Python installer separately.

  1. Download and install Python 3.8.x from python.org. Other Python installations or versions are not supported.

  2. Activate the plpython3u extension with the command CREATE EXTENSION plpython3u;

  3. You can now create functions and procedures that use the language plpython3u.

Postgres.app with PostgreSQL 13 does not support Python 2.7.

PostgreSQL 12 and earlier

Postgres.app includes the plpython2u extension. It links to Python 2.7, which is included in macOS.

  1. Activate the plpython2u extension with the command CREATE EXTENSION plpython2u;

  2. You can now create functions and procedures that use the language plpython2u.