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https://github.com/psycopg/psycopg

New generation PostgreSQL database adapter for the Python programming language
https://github.com/psycopg/psycopg

database development driver postgresql python

Last synced: 9 days ago
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New generation PostgreSQL database adapter for the Python programming language

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README 

        
Psycopg 3 -- PostgreSQL database adapter for Python

===================================================



Psycopg 3 is a modern implementation of a PostgreSQL adapter for Python.



Installation

------------



Quick version::



    pip install --upgrade pip               # upgrade pip to at least 20.3

    pip install "psycopg[binary,pool]"      # install binary dependencies



For further information about installation please check `the documentation`__.



.. __: https://www.psycopg.org/psycopg3/docs/basic/install.html



Hacking

-------



In order to work on the Psycopg source code you need to have the ``libpq``

PostgreSQL client library installed in the system. For instance, on Debian

systems, you can obtain it by running::



    sudo apt install libpq5



After which you can clone this repository::



    git clone https://github.com/psycopg/psycopg.git

    cd psycopg



Please note that the repository contains the source code of several Python

packages: that's why you don't see a ``setup.py`` here. The packages may have

different requirements:



- The ``psycopg`` directory contains the pure python implementation of

  ``psycopg``. The package has only a runtime dependency on the ``libpq``, the

  PostgreSQL client library, which should be installed in your system.



- The ``psycopg_c`` directory contains an optimization module written in

  C/Cython. In order to build it you will need a few development tools: please

  look at `Local installation`__ in the docs for the details.



- The ``psycopg_pool`` directory contains the `connection pools`__

  implementations. This is kept as a separate package to allow a different

  release cycle.



.. __: https://www.psycopg.org/psycopg3/docs/basic/install.html#local-installation

.. __: https://www.psycopg.org/psycopg3/docs/advanced/pool.html



You can create a local virtualenv and install the packages `in

development mode`__, together with their development and testing

requirements::



    python -m venv .venv

    source .venv/bin/activate

    pip install -e "./psycopg[dev,test]"    # for the base Python package

    pip install -e ./psycopg_pool           # for the connection pool

    pip install ./psycopg_c                 # for the C speedup module



.. __: https://pip.pypa.io/en/stable/topics/local-project-installs/#editable-installs



Please add ``--config-settings editable_mode=strict`` to the ``pip install

-e`` above if you experience `editable mode broken`__.



.. __: https://github.com/pypa/setuptools/issues/3557



Now hack away! You can run the tests using::



    psql -c 'create database psycopg_test'

    export PSYCOPG_TEST_DSN="dbname=psycopg_test"

    pytest