Python API and command-line toolset for Twitter

https://github.com/sixohsix/twitter

Compatibility API between asyncio/Twisted/Trollius

https://github.com/crossbario/txaio

Runtime type checker for Python

https://github.com/agronholm/typeguard

Typing stubs for Jinja2

https://pypi.org/project/types-Jinja2/

Typing stubs for MarkupSafe

https://pypi.org/project/types-MarkupSafe/

Typing stubs for PyYAML

https://pypi.org/project/types-PyYAML/

Typing stubs for docutils

https://github.com/python/typeshed/tree/main/stubs/docutils

Typing stubs for jsonschema

https://pypi.org/project/types-jsonschema/

Typing stubs for psutil

https://github.com/python/typeshed/tree/main/stubs/psutil

Typing stubs for python-dateutil

https://github.com/python/typeshed

Typing stubs for requests

https://pypi.org/project/types-requests/

Typing stubs for setuptools

https://github.com/python/typeshed/tree/main/stubs/setuptools

Typing stubs for toml

https://github.com/python/typeshed/tree/main/stubs/toml

Typing stubs for urllib3

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

Backported and Experimental Type Hints for Python 3.5+

https://github.com/python/typing_extensions

Runtime inspection utilities for typing module

https://github.com/ilevkivskyi/typing_inspect

Filters to enhance web typography

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

Provider of IANA time zone data

https://github.com/python/tzdata

Portable, lightweight MessagePack (de)serializer

https://github.com/vsergeev/u-msgpack-python

Bridge between UFOs and FontTools

https://github.com/googlefonts/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

Script to normalize the XML and other data inside of a UFO

https://github.com/unified-font-object/ufoNormalizer

Read, write and generate UFOs with designspace data

https://github.com/LettError/ufoProcessor

Ultra fast JSON encoder and decoder for Python

https://github.com/esnme/ultrajson

Simple package

https://github.com/Carreau/undefined

Unicodedata backport updated to the latest Unicode version

https://github.com/fonttools/unicodedata2

ASCII transliterations of Unicode text

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

Python library to parse and interact with unified diff data

https://github.com/matiasb/python-unidiff

New features in unittest backported to Python 2

https://github.com/garbas/unittest2

Cross-platform uptime library

https://github.com/Cairnarvon/uptime

Python implementation of URI Template

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

RFC 3986 compliant, Unicode-aware, scheme-agnostic replacement for urlparse

https://github.com/tkem/uritools

URL normalization for Python

https://github.com/niksite/url-normalize

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

https://github.com/urllib3/urllib3

Python wrapper around libusb

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

Fast drop-in replacement of asyncio event loop based on libuv

https://github.com/MagicStack/uvloop

Verifies if an email address is valid and really exists

https://github.com/syrusakbary/validate_email

Simple data validation in Python

https://pypi.org/project/validators/

Python module to validate VAT numbers

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

Automatically mock HTTP interactions to simplify and speed up testing

https://github.com/kevin1024/vcrpy

Easy VCS-based management of project version strings

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

Obtain package version from repo tags

https://github.com/jwodder/versioningit

Tool for creating isolated Python environments

https://virtualenv.pypa.io

Navigate HTTP resources using WADL files as guides

https://launchpad.net/wadllib

Python WSGI server

https://docs.pylonsproject.org/projects/waitress/en/latest/ https://github.com/Pylons/waitress

Python API library to monitor file system events

https://github.com/gorakhargosh/watchdog

Wildcard/glob file name matcher

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

Determine the printable width of the terminal

https://github.com/jquast/wcwidth