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

Python wrapper around libusb

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

Drop-in replacement for Python UUID

https://aminalaee.github.io/uuid-utils/ https://github.com/aminalaee/uuid-utils

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

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

Wildcard/glob file name matcher

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

Determine the printable width of the terminal

https://github.com/jquast/wcwidth

Character encoding aliases for legacy web content

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

Websocket client for python

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

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

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

Sans-IO WebSocket protocol implementation

https://pypi.org/project/wsproto/

Python 2 library to access freedesktop.org standards

http://freedesktop.org/Software/pyxdg

Reading data and formatting information from Excel files

https://www.python-excel.org/ https://github.com/python-excel/xlrd

XML parser that returns python dictionaries

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

Python bindings for the xxHash library

https://github.com/ifduyue/python-xxhash

Linter for YAML files

https://github.com/adrienverge/yamllint

Yet another URL library

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

Yet Another SWF Parser

https://github.com/facundobatista/yaswfp

Python module to retrieve stock quote data from Yahoo Finance

https://github.com/cgoldberg/ystockquote

Basic inter-process locks

https://pypi.org/project/zc.lockfile/

Periodicly backup zfs filesystems to other locations

https://github.com/psy0rz/zfs_autobackup

Backport of pathlib-compatible object wrapper for zip files

https://github.com/jaraco/zipp

Zope Component Architecture

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

Zope Configuration Markup Language (ZCML)

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

Very basic event publishing system

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

Interfaces for Python

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

Zope Interface extension for defining data schemas

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

Zopfli module for python

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

Py3c helps you port C extensions to Python 3

https://github.com/encukou/py3c

Seamless interoperability between C++11 and Python (cmake part)

https://pybind11.readthedocs.io/en/stable/ https://github.com/pybind/pybind11

Using nlohmann::json with pybind11

https://github.com/pybind/pybind11_json

Pybind11 bindings for the Abseil C++ Common Libraries

https://github.com/pybind/pybind11_abseil