Minimal low-level HTTP client

https://github.com/encode/httpcore

Comprehensive HTTP client library

https://github.com/httplib2/httplib2

Next generation HTTP client

https://github.com/encode/httpx

Python module that decodes binary streams into HTTP/2 frames

http://hyper.rtfd.org/

Featureful, correct URL for Python

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

Library for property based testing

https://github.com/HypothesisWorks/hypothesis/tree/master/hypothesis-python

Internationalized Domain Names in Applications (IDNA)

https://github.com/kjd/idna

Patch ssl.match_hostname for Unicode(idna) domains support

https://pypi.org/project/idna_ssl/

Python image size library

https://github.com/shibukawa/imagesize_py

Read metadata from Python packages

https://github.com/python/importlib_metadata

Read resources from Python packages

https://github.com/python/importlib_resources

Library that versions your Python projects

https://pypi.org/project/incremental/

Editable interval tree data structure for Python 2 and 3

https://github.com/chaimleib/intervaltree

Python task execution tool & library

https://github.com/pyinvoke/invoke

Google open source IPv4/IPv6 manipulation library in Python

https://github.com/google/ipaddr-py

Simple module to parse ISO 8601 dates

https://bitbucket.org/micktwomey/pyiso8601

ISO 8601 date/time/duration parser and formater

https://pypi.org/project/isodate/

Python import sorter utility

https://github.com/PyCQA/isort

Various helpers to pass data in untrusted environments

https://github.com/mitsuhiko/itsdangerous/

Shared namespace shim for py-jaraco.* ports

Python class routines

https://github.com/jaraco/jaraco.classes

Context managers by jaraco

https://github.com/jaraco/jaraco.context

Additional functools for Python

https://github.com/jaraco/jaraco.functools

Low-level, pure Python DBus protocol wrapper

https://gitlab.com/takluyver/jeepney

JSON Matching Expressions

https://github.com/jmespath/jmespath.py

JOSE protocol implementation in Python

https://josepy.readthedocs.io/en/latest/

Form validation for JSON-like data

https://github.com/RussellLuo/jsonform

Implementation of JSON Reference for Python

https://pypi.org/project/jsonref/

JSON Schema validation for Python

https://github.com/Julian/jsonschema

Serializer for JSON-like data in Python

https://github.com/RussellLuo/jsonsir

Store and access your passwords safely

https://github.com/jaraco/keyring

Alternate Python keyring implementations

https://pypi.org/project/keyrings.alt/

Kitchen contains a cornucopia of useful code

https://pypi.org/project/kitchen/

Fast implementation of the Cassowary constraint solver

https://github.com/nucleic/kiwi

Fast and thorough lazy object proxy

https://github.com/ionelmc/python-lazy-object-proxy

Library for programs conforming to DNS RFCs and drafts

https://www.nlnetlabs.nl/projects/ldns/

libpeas Python support

http://live.gnome.org/libpeas

Python bindings for Libvirt virtualization API

https://libvirt.org/python.html

Python interface for XML parser library for GNOME

http://xmlsoft.org/

New features in linecache backported to Python 2

https://pypi.org/project/linecache2/

Python bindings for low-level FUSE API

https://bitbucket.org/nikratio/python-llfuse

Platform-independent file locking module

https://github.com/smontanaro/pylockfile

Toolkit for logging of library method calls

https://github.com/ppolewicz/logfury

Pythonic binding for the libxml2 and libxslt libraries

https://lxml.de/

Python binding for the LZ4 compression library

https://github.com/python-lz4/python-lz4

Python binding for the LZMA compression library

http://www.joachim-bauch.de/projects/python/pylzma

Convert markdown formatted file with reST markup to reST format

https://github.com/miyakogi/m2r

Python module for determining file type

https://www.darwinsys.com/file/

Wrapper for email standard library

https://github.com/SpamScope/mail-parser

Super-fast templating language in Python

http://www.makotemplates.org/