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

BibTeX-compatible bibliography processor in Python

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

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

Cython wrapper for the C++ translation of Clipper library

https://github.com/greginvm/pyclipper

Python package for code generation

https://github.com/bjodah/pycodeexport

Python style guide checker

https://pypi.org/project/pycodestyle/

Utilities for Bitcoin and altcoin addresses/transaction manipulation

https://github.com/richardkiss/pycoin

Package for compilation (meta programming)

https://github.com/bjodah/pycompilation

C parser in Python

https://github.com/eliben/pycparser

Python Cryptography Toolkit

https://pycrypto.org

Cryptographic library for Python

https://www.pycryptodome.org/en/latest/

CUPS bindings for Python

https://github.com/zdohnal/pycups

Python interface to libcurl

http://pycurl.io/

Passive checker of Python programs

https://github.com/PyCQA/pyflakes

Python FTP server library

https://github.com/giampaolo/pyftpdlib

Syntax highlighter written in Python

https://pygments.org/

Syntax highlighter written in Python

https://pygments.org/

Hamcrest matchers for Python

https://github.com/hamcrest/PyHamcrest

Python extension wrapping IBM's ICU C++ API

https://pypi.org/project/PyICU/

Python interface to (lib)inotify

https://github.com/seb-m/pyinotify

Jade syntax template adapter for Django, Jinja2, Mako and Tornado templates

https://github.com/syrusakbary/pyjade

JSON Web Token implementation in Python

https://github.com/jpadilla/pyjwt

Sphinx themes for Pylons Project documentation

https://github.com/Pylons/pylons-sphinx-themes

Postfix queue control python tool

https://github.com/outini/pymailq

Pure Python MySQL Driver

https://github.com/PyMySQL/PyMySQL

Python binding to the Networking and Cryptography library

https://pypi.org/project/PyNaCl/

Common base Sphinx theme for PyPA projects

https://github.com/pypa/pypa-docs-theme

General parsing module for Python

https://pypi.org/project/pyparsing/

Module to hyphenate text based on Hunspell dictionaries

https://pyphen.org/

Wrappers to call pyproject.toml-based build backend hooks

https://github.com/pypa/pyproject-hooks

Pure Python QR code generator with SVG, EPS, PNG and terminal output

https://github.com/mnooner256/pyqrcode

Generate and parse RFC 3339 timestamps

https://pypi.org/project/pyRFC3339/

Persistent/Functional/Immutable data structures

https://github.com/tobgu/pyrsistent

Python interface to sendfile(2)

https://github.com/giampaolo/pysendfile

Serial port encapsulation library for Python

https://github.com/pyserial/pyserial

Python SOCKS module

https://github.com/Anorov/PySocks

Deal PySol FC Cards

https://pypi.org/project/pysol-cards/

SPF (Sender Policy Framework) implemented in Python

https://github.com/sdgathman/pyspf

Snowball Stemming Algorithms for Information Retrieval

https://pypi.org/project/PyStemmer/

Simple powerful testing with Python

https://docs.pytest.org/en/latest/

Py.test plugin providing fixtures and markers for asyncio

https://pypi.org/project/pytest-asyncio/

pytest plugin to enable format checking with black

https://github.com/shopkeep/pytest-black

Pytest plugin with mechanisms for caching across test runs

https://bitbucket.org/hpk42/pytest-cache/

Py.test plugin to capture log messages

https://bitbucket.org/memedough/pytest-capturelog/overview

Pytest plugin for measuring coverage

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