Asynchronous networking framework written in Python

https://twistedmatrix.com/

Python API and command-line toolset for Twitter

https://github.com/sixohsix/twitter

Compatibility API between asyncio/Twisted/Trollius

https://github.com/crossbario/txaio

Asynchronous Python HTTP for Humans

https://github.com/tardyp/txrequests

Fork of Python ast modules with type comment support

https://github.com/python/typed_ast

Backported and Experimental Type Hints for Python 3.5+

https://github.com/python/typing/tree/master/typing_extensions

Runtime inspection utilities for typing module

https://github.com/ilevkivskyi/typing_inspect

Filters to enhance web typography

https://github.com/mintchaos/typogrify/

Bridge between UFOs and FontTools

https://github.com/googlei18n/ufo2ft

Low-level Unified Font Object (UFO) reader and writer

http://unifiedfontobject.org/

UFO font processing library

https://github.com/fonttools/ufoLib2

UFO source file linter

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

Ultra fast JSON encoder and decoder for Python

https://github.com/esnme/ultrajson

Unicodedata backport and updates

https://github.com/mikekap/unicodedata2

ASCII transliterations of Unicode text

https://pypi.org/project/Unidecode/

New features in unittest backported to Python 2

https://pypi.org/project/unittest2/

Cross-platform uptime library

https://github.com/Cairnarvon/uptime

Python implementation of URI Template

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

HTTP library with thread-safe connection pooling, file post, and more

https://pypi.org/project/urllib3/

Python wrapper around libusb

http://pyusb.github.io/pyusb/

Verifies if an email address is valid and really exists

https://github.com/syrusakbary/validate_email

Python module to validate VAT numbers

http://code.google.com/p/vatnumber/

Tool for creating isolated Python environments

https://virtualenv.pypa.io

Wildcard/glob file name matcher

https://pypi.org/project/wcmatch/

Determine the printable width of the terminal

https://github.com/jquast/wcwidth

Converts HTML/CSS documents to PDF

https://weasyprint.org/

Character encoding aliases for legacy web content

https://github.com/SimonSapin/python-webencodings

WSGI request and response Python object

https://webob.org/

Websocket client for python

https://github.com/websocket-client/websocket-client

Implementation of the WebSocket Protocol (RFC 6455 and 7692)

https://pypi.org/project/websockets/

Python utilities collection for building WSGI applications

https://palletsprojects.com/p/werkzeug/ https://github.com/pallets/werkzeug

Built-package format for Python

https://github.com/pypa/wheel

Decorators, wrappers and monkey patching

https://github.com/GrahamDumpleton/wrapt

WebSocket Accelerator for ws4py and AutobahnPython

https://github.com/methane/wsaccel

Xcffib is a replacement for xpyb, also is a XCB python binding

https://github.com/tych0/xcffib

Python 2 library to access freedesktop.org standards

http://freedesktop.org/Software/pyxdg

XML parser that returns python dictionaries

https://pypi.org/project/xmltodict/

Python YAML parser

https://pyyaml.org/

Linter for YAML files

https://github.com/adrienverge/yamllint

Yet another URL library

https://github.com/aio-libs/yarl

Python module to retrieve stock quote data from Yahoo Finance

https://github.com/cgoldberg/ystockquote

Backport of pathlib-compatible object wrapper for zip files

https://github.com/jaraco/zipp

Zope Component Architecture

https://pypi.org/project/zope.component/

Very basic event publishing system

https://pypi.org/project/zope.event/

Interfaces for Python

https://pypi.org/project/zope.interface/

Py3c helps you port C extensions to Python 3

https://github.com/encukou/py3c

Common files for the Python bindings for the D-BUS messaging system

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

Common files for the Python bindings for GObject

Analyzes python source code looking for bugs and signs of poor quality

https://www.pylint.org/

Python driver for MongoDB

https://github.com/mongodb/mongo-python-driver