Pure-Python Interface to the PostgreSQL Database

https://github.com/tlocke/pg8000

Factory+Registry pattern for Python classes

https://github.com/todofixthis/class-registry/

Pidfile management for Python

https://pypi.org/project/pid/

Fork of the Python Imaging Library (PIL)

https://python-pillow.org/

Tool for installing and managing Python packages

https://pip.pypa.io/en/latest/

Importable pip API

https://github.com/di/pip-api

Interface Python with pkg-config

https://pypi.org/project/pkgconfig/

Query metadatdata from sdists / bdists / installed packages

https://pypi.org/project/pkginfo/

Python module for determining appropriate platform-specific dirs

https://github.com/platformdirs/platformdirs

Plugin and hook calling mechanisms for Python

https://github.com/pytest-dev/pluggy

Plugin and hook calling mechanisms for Python

https://github.com/pytest-dev/pluggy

Support library for building plugins sytems in Python

https://github.com/mitsuhiko/pluginbase

Python Lex-Yacc

http://www.dabeaz.com/ply/

Python PNG encoder/decoder

https://github.com/drj11/pypng

Collection of helpful Python tools

https://pypi.org/project/pockets/

Poetry PEP 517 Build Backend

https://github.com/python-poetry/poetry-core

Python library to parse and manage gettext catalogs

https://bitbucket.org/izi/polib/

Band-oriented PDF report generation from database query

http://newcenturycomputers.net/projects/pollyreports.html

Monitors TCP ports for bound or unbound states

https://github.com/jaraco/portend

TLS client policy for Postfix according to domain MTA-STS policy

https://pypi.python.org/pypi/postfix-mta-sts-resolver

Python 3 compatible PostgreSQL database driver and tools

http://python.projects.postgresql.org/

Lightweight YAML Parser

https://pypi.org/project/poyo/

Turns CSS blocks into style attributes

https://github.com/peterbe/premailer

ReportLab's templating system

http://preppy.readthedocs.org/en/latest/

Library for stubbing in Python

https://github.com/alex/pretend

Pure-Python implementation of the HTTP/2 priority tree

https://github.com/python-hyper/priority

Pure-Python implementation of the HTTP/2 priority tree

https://github.com/python-hyper/priority

Library for building powerful interactive command lines in Python

https://python-prompt-toolkit.readthedocs.io/en/master/ https://github.com/prompt-toolkit/python-prompt-toolkit

Linter for prose

https://github.com/amperser/proselint

Google protobuf Python Client Library

https://github.com/protocolbuffers/protobuf

Python wrapper for Adobe PostScript autohinter

https://github.com/adobe-type-tools/psautohint

Process utilities module for Python

https://pypi.org/project/psutil/

High performance Python adapter for PostgreSQL

http://initd.org/psycopg/

Run a subprocess in a pseudo terminal

https://github.com/pexpect/ptyprocess

Get public suffix of domain name from Public Suffix List (Fork)

https://github.com/nexb/python-publicsuffix2

Safely evaluate AST nodes without side effects

https://github.com/alexmojaki/pure_eval

Library with cross-python path, ini-parsing, io, code, log facilities

https://pylib.org/

Pure Python PartiQL Parser

https://github.com/getmoto/py-partiql-parser

Universal Binary JSON encoder/decoder

https://github.com/Iotic-Labs/py-ubjson

Python 3 DNS library

https://pypi.org/project/py3dns/

Produce pretty and readable YAML-serialized data

https://github.com/mk-fg/pretty-yaml

ASN.1 toolkit for Python

http://snmplabs.com/pyasn1/

Collection of ASN.1 data structures for py-pyasn1

https://github.com/etingof/pyasn1-modules

Seamless interoperability between C++11 and Python

https://github.com/pybind/pybind11

BibTeX-compatible bibliography processor in Python

https://bitbucket.org/pybtex-devs/pybtex/

Docutils backend for pybtex

https://github.com/mcmtroffaes/pybtex-docutils

Python interface to c-ares

https://pypi.org/project/pycares/

Library for making charts with Python

https://bitbucket.org/lgs/pycha

GTK chess client written in Python

http://www.pychess.org/

Python ClamD interface module

https://xael.org/pages/pyclamd-en.html