Cssselect parses CSS3 Selectors and translates them to XPath 1.0

https://github.com/scrapy/cssselect

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/googlei18n/cu2qu

Coroutine-based library for concurrent Python systems programming

https://github.com/dabeaz/curio

Composable style cycles

https://github.com/matplotlib/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/

Datadog Python library

https://github.com/DataDog/datadogpy

Extensions to the standard Python datetime module

https://dateutil.readthedocs.io

Python bindings for the D-BUS messaging system

https://dbus.freedesktop.org/doc/dbus-python/

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/typesupply/defcon

XML bomb protection for Python stdlib modules

https://bitbucket.org/tiran/defusedxml

Remove TrueType instruction sets (hints) in fonts

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

Library to handle automated deprecations

https://pypi.org/project/deprecation/

Run coverage and linting reports on diffs

https://github.com/Bachmann1234/diff_cover

In-depth comparison of files, archives, and directories

https://diffoscope.org/

Serialize all of python

https://pypi.org/project/dill/

Low-level components of distutils2 and higher-level APIs

https://github.com/pypa/distlib

Linux OS platform information API

https://github.com/nir0s/distro

User registration with social account authentication

https://allauth.org/ https://docs.allauth.org/en/latest/ https://github.com/pennersr/django-allauth

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 library to help interaction with Mailman

https://gitlab.com/mailman/django-mailman3

Django Debug Toolbar panel for Requests

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

High-level Python Web Framework

https://www.djangoproject.com/

High-level Python Web Framework

https://www.djangoproject.com/

High-level Python Web Framework

https://www.djangoproject.com/

Python library for DKIM email signing and verification

https://launchpad.net/dkimpy

Manipulate DNS records on various DNS providers in a standardized way

https://github.com/AnalogJ/lexicon

DNS toolkit for Python

http://www.dnspython.org/

DNS toolkit for Python - 1.x release

http://www.dnspython.org/

Python library for the Docker Engine API

https://github.com/docker/docker-py

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

Add flag to ignore unicode literal prefixes in doctests

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

Python Documentation Utilities

https://docutils.sourceforge.io/

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

Official Dropbox API Client

https://dropbox-sdk-python.readthedocs.io/en/latest/ https://github.com/dropbox/dropbox-sdk-python

Helpful CLI utilities for querying and connecting to EC2 instances

https://github.com/FlipPath/ec2-cli-tools

ECDSA cryptographic signature library (pure python)

https://github.com/warner/python-ecdsa

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

Robust email address syntax and deliverability validation library

https://github.com/JoshData/python-email-validator

Extensions to py-rich

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