ANSII Color formatting for output in terminal

https://pypi.org/project/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

Repository of test results

https://launchpad.net/testrepository

PyUnit extension for dependency injection

https://pypi.org/project/testscenarios/

Extensions to the Python standard library unit testing framework

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

Pure Python TFTP library

https://pypi.org/project/tftpy/

Complete yet simple CSS parser for Python

https://pypi.org/project/tinycss/

Low-level CSS parser for Python

https://github.com/Kozea/tinycss2

Python bindings to the Tk widget set

Separate the TLD from the registered domain and subdomains of a URL

https://github.com/john-kurkowski/tldextract

Python library for parsing and creating TOML

https://github.com/uiri/toml

Lil' TOML parser

https://github.com/hukkin/tomli

Lil' TOML writer

https://github.com/hukkin/tomli-w

Style-preserving TOML library

https://github.com/sdispater/tomlkit

Python Web Server from FriendFeed

https://www.tornadoweb.org/

Building newsfiles for your project

https://github.com/twisted/towncrier

Virtualenv-based automation of test activities

https://tox.readthedocs.org/

Fast, extensible progress bar for Python

https://github.com/tqdm/tqdm

New features in traceback backported to Python 2

https://pypi.org/project/traceback2/

Requests-like API built on top of twisted.web's Agent

https://github.com/twisted/treq

Port of the Tulip project (asyncio module, PEP 3156) on Python 2

https://github.com/haypo/trollius

Top quality TLS certs while you wait, for the discerning tester

https://github.com/python-trio/trustme

Python wrapper for ttfautohint

https://github.com/fonttools/ttfautohint-py

Python progress reporting to /dev/tty

https://liw.fi/ttystatus/

Collection of utilities for interacting with PyPI

https://github.com/pypa/twine

Collection of utilities for interacting with PyPI

https://github.com/pypa/twine

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