Automagic shell tab completion for Python CLI applications

https://docs.iterative.ai/shtab/ https://github.com/iterative/shtab

Simple, fast, extensible JSON encoder/decoder

https://pypi.python.org/pypi/simplejson

Sans-io socks proxy client/server library/framework

https://pypi.python.org/pypi/siosocks

Python to C and C++ bindings generator

https://github.com/Python-SIP/sip

Python 2 and 3 compatibility utilities

https://pypi.python.org/pypi/six

Translate plain ASCII punctuation into smart typographic HTML

https://github.com/leohemsted/smartypants.py

Sliding-window memory map manager

https://smmap.readthedocs.io/en/latest/ https://github.com/gitpython-developers/smmap

Sniff out which async library your code is running under

https://sniffio.readthedocs.io/en/latest/ https://github.com/python-trio/sniffio

Snowball stemming library collection for Python

https://pypi.python.org/pypi/snowballstemmer

Sans-I/O implementation of SOCKS4, SOCKS4A, and SOCKS5

https://github.com/sethmlarson/socksio

Python Sorted Container Types: SortedList, SortedDict, and SortedSet

https://www.grantjenks.com/docs/sortedcontainers/

Play and record sound through OSS in python programs

https://github.com/spatialaudio/python-sounddevice

CSS4 selector implementation for BeautifulSoup

https://github.com/facelessuser/soupsieve

SPARQL endpoint interface to Python

http://rdflib.github.io/sparqlwrapper/

Command line interface for testing internet bandwidth

https://github.com/sivel/speedtest-cli

Sphinx extension for rendering tables written in markdown

https://github.com/ryanfox/sphinx-markdown-tables

Wrap README-only projects in a dynamic Sphinx shell

https://github.com/stephenmcd/sphinx-me/

Mobile-friendly py-sphinx theme

https://github.com/snide/sphinx_rtd_theme/

Extension which outputs Apple help books

https://www.sphinx-doc.org/

Sphinx extension which outputs Devhelp document

https://www.sphinx-doc.org/

Sphinx extension which renders HTML help files

https://www.sphinx-doc.org/en/master/ https://github.com/sphinx-doc/sphinxcontrib-htmlhelp

Sphinx extension which renders display math in HTML via JavaScript

https://www.sphinx-doc.org/

Sphinx extension that parses both NumPy and Google style docstrings

https://pypi.org/project/sphinxcontrib-napoleon/

Sphinx extension which outputs QtHelp document

https://www.sphinx-doc.org/en/master/ https://github.com/sphinx-doc/sphinxcontrib-qthelp

Sphinx extension which outputs serialized HTML files (json and pickle)

https://www.sphinx-doc.org/en/master/ https://github.com/sphinx-doc/sphinxcontrib-serializinghtml

Python SQL toolkit and Object Relational Mapper 1.0.x

http://www.sqlalchemy.org/

Python functions for working with SQLite FTS4 search

https://github.com/simonw/sqlite-fts4

Standard Python binding to the SQLite3 library

Non-validating SQL parser for Python

https://github.com/andialbrecht/sqlparse

Expand a regular expression to its possible matches

https://github.com/google/sre_yield

Extract data from python stack frames and tracebacks for informative displays

https://github.com/alexmojaki/stack_data

Little ASGI library that shines

https://starlette.dev/ https://github.com/Kludex/starlette

Python module to handle standardized numbers and codes

https://pypi.org/project/python-stdnum/

Interface description language (IDL) for APIs

https://github.com/dropbox/stone

Strict, simple, lightweight RFC3339 functions

https://github.com/danielrichman/strict-rfc3339

Strict, typed YAML parser

https://hitchdev.com/strictyaml

Generate random strings matching a pattern

https://github.com/simoncozens/stringbrewer

Structured Logging for Python

https://www.structlog.org/

Utility belt for automated testing in Python for Python

https://github.com/gabrielfalcao/sure

SVG path objects and parser

https://pypi.org/project/svg.path/

Zero-dependency pytest snapshot plugin

https://tophat.github.io/syrupy/

Pretty-print tabular data in Python

https://bitbucket.org/astanin/python-tabulate

Traceback serialization library in Python

https://pypi.org/project/tblib/

Retry code until it succeeds

https://tenacity.readthedocs.io/en/latest/ https://github.com/jd/tenacity

ANSII Color formatting for output in terminal

https://pypi.python.org/pypi/termcolor

Collection of helpers and mock objects for unit tests and doc tests

https://github.com/Simplistix/testfixtures

Test utilities for Python code working with files and commands

https://github.com/jupyter/testpath

PyUnit extension for dependency injection

https://github.com/testing-cabal/testscenarios

Extensions to the Python standard library unit testing framework

https://github.com/testing-cabal/testtools

Most basic port of Perl's Text::Unidecode module

https://github.com/kmike/text-unidecode