Iteration support for datetime objects with cron like format(2.x)

https://pypi.org/project/croniter/

Test vectors for the cryptography package

https://cryptography.io/en/latest/development/test-vectors/ https://github.com/pyca/cryptography/tree/main/vectors

CSS related utilities (parsing, serialization, etc) for python

https://github.com/ebook-utils/css-parser

Python port of YUI CSS Compressor

https://github.com/sprymix/csscompressor

CSS selectors for Python ElementTree

https://github.com/Kozea/cssselect2

CSS Cascading Style Sheets library for Python

https://github.com/jaraco/cssutils

Cubic-to-quadratic bezier curve conversion

https://github.com/googlefonts/cu2qu

Coroutine-based library for concurrent Python systems programming

https://github.com/dabeaz/curio

Composable style cycles

https://matplotlib.org/cycler/

Trivial extension that just raises an exception

https://github.com/twisted/cython-test-exception-raiser

Well-behaved daemon framework for Python

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

Data-Driven Tests for Python Unittest

https://readthedocs.org/projects/ddt/

Better living through Python with decorators

https://github.com/micheles/decorator

Set of flexible objects for representing UFO data

https://github.com/robotools/defcon

XML bomb protection for Python stdlib modules

https://github.com/tiran/defusedxml

Remove TrueType instruction sets (hints) in fonts

https://github.com/source-foundry/dehinter

Library to handle automated deprecations

https://github.com/briancurtin/deprecation

In-depth comparison of files, archives, and directories

https://diffoscope.org/

Serialize all of python

https://dill.readthedocs.io/en/latest/

Do dirty (but extremely useful) things with equals

https://dirty-equals.helpmanual.io/latest/ https://github.com/samuelcolvin/dirty-equals

Low-level components of distutils2 and higher-level APIs

https://github.com/pypa/distlib

Linux OS platform information API

https://github.com/python-distro/distro

Configurable set of panels to display debug information

https://django-debug-toolbar.readthedocs.io/en/latest/ https://github.com/jazzband/django-debug-toolbar

Lightweight app for interacting with gravatars

https://github.com/twaddington/django-gravatar

Django Debug Toolbar panel for Requests

https://github.com/marceltschoppch/django-requests-debug-toolbar

High-level Python Web Framework

https://www.djangoproject.com/

DNS toolkit for Python - 1.x release

https://www.dnspython.org/

Python bindings for the docker credentials store API

https://github.com/shin-/dockerpy-creds/

Pythonic argument parser, that will make you smile

http://docopt.org/

Parse Python docstrings in ReST, Google and Numpydoc format

https://github.com/rr-/docstring_parser

Parse Python docstrings in ReST, Google and Numpydoc format

https://github.com/rr-/docstring_parser

Add flag to ignore unicode literal prefixes in doctests

https://pypi.python.org/pypi/doctest-ignore-unicode

Python Documentation Utilities

http://docutils.sourceforge.net/

Helpful functions for Python

https://domdf-python-tools.readthedocs.io/en/latest/ https://github.com/domdfcoding/domdf_python_tools

Simple implementation of contracts for Python

https://github.com/deadpixi/contracts

Dynamic version generation

https://github.com/mtkennerly/dunamai

Editable installations

https://github.com/pfmoore/editables

EditorConfig File Locator and Interpreter for Python

https://editorconfig.org/

XPath 1.0/2.0/3.0 parsers and selectors for ElementTree and lxml

https://github.com/sissaschool/elementpath

Extensions to py-rich

https://pypi.org/project/enrich/

Discover and load entry points from installed packages

https://github.com/takluyver/entrypoints

Python 3.4 Enum backported to 3.3, 3.2, 3.1, 2.7

https://pypi.python.org/pypi/enum34

Like typing._eval_type, but lets older Python versions use newer typing features

https://github.com/alexmojaki/eval_type_backport

Bindings to the Linux input handling subsystem

https://pypi.org/project/evdev/

Backport of PEP 654 (exception groups)

https://github.com/agronholm/exceptiongroup

Distributed Python deployment and communication

https://codespeak.net/execnet/

Get the currently executing AST node of a frame, and other information

https://github.com/alexmojaki/executing

Expand system variables Unix style

https://github.com/sayanarijit/expandvars

Useful extra bits for Python

https://pypi.org/project/extras/

Scans log files and bans IP that makes too many password failures

http://www.fail2ban.org/wiki/index.php/Main_Page