Identify specific nodes in a JSON document (RFC 6901)

https://pypi.org/project/jsonpointer/

Keystone Assembler Engine with Python bindings

https://www.keystone-engine.org/

Fast implementation of the Cassowary constraint solver

https://github.com/nucleic/kiwi

Load subpackages and functions on demand easily

https://scientific-python.org/specs/spec-0001/

Library for programs conforming to DNS RFCs and drafts

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

Python interface for XML parser library for GNOME

http://xmlsoft.org/

Toolkit for logging of library method calls

https://github.com/ppolewicz/logfury

Handlers for the Python standard library logging package

https://bitbucket.org/vinay.sajip/logutils/

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 implementation of Markdown

https://pythonhosted.org/Markdown/

Implements XML/HTML/XHTML Markup safe string for Python

https://github.com/pallets/markupsafe

Matplotlib Inline Back-end for IPython and Jupyter

https://pypi.org/project/matplotlib-inline/

Stateful programmatic web browsing in Python

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

Module for monitoring memory usage of a python program

https://github.com/pythonprofilers/memory_profiler

Fastest markdown parser in pure Python

https://github.com/lepture/mistune

Fastest markdown parser in pure Python

https://github.com/lepture/mistune

Python Library for Arbitrary-precision Floating-point Arithmetic

http://www.mpmath.org/

Manipulation of IPv4, IPv6, CIDR, EUI and MAC network addresses

https://github.com/drkjam/netaddr/

Node.js virtual environment builder

https://ekalinin.github.io/nodeenv/

The New Numeric Extension to Python

https://www.numpy.org/

Fundamental package for array computing in Python

https://www.numpy.org/

RFC-compliant implementation of the OAuth request-signing logic

https://github.com/idan/oauthlib

OpenAPI schema validation for Python

https://github.com/python-openapi/openapi-schema-validator

Python wrapper for the OpenType Sanitizer

https://github.com/googlefonts/ots-python

Flexible, high-performance data analysis in Python

https://pandas.pydata.org/

Comprehensive password hashing framework supporting over 30 schemes

https://bitbucket.org/ecollins/passlib

Pure-Python PDF toolkit

http://pybrary.net/pyPdf/

Pure-Python PDF toolkit

https://mstamy2.github.io/PyPDF2/

WSGI object-dispatching web framework

https://github.com/pecan/pecan/

Pure-Python Interface to the PostgreSQL Database

https://github.com/tlocke/pg8000

Support library for building plugins sytems in Python

https://github.com/mitsuhiko/pluginbase

Python Lex-Yacc

http://www.dabeaz.com/ply/

Collection of helpful Python tools

https://pypi.org/project/pockets/

Fetch your sample data files

https://github.com/fatiando/pooch

Python 3 compatible PostgreSQL database driver and tools

http://python.projects.postgresql.org/

ReportLab's templating system

http://preppy.readthedocs.org/en/latest/

Library for stubbing in Python

https://github.com/alex/pretend

Library for building powerful interactive command lines in Python

https://python-prompt-toolkit.readthedocs.io/en/master/ https://github.com/prompt-toolkit/python-prompt-toolkit

Linter for prose

https://github.com/amperser/proselint

Google protobuf Python Client Library

https://github.com/protocolbuffers/protobuf

Process utilities module for Python

https://pypi.org/project/psutil/

Seamless interoperability between C++11 and Python

https://github.com/pybind/pybind11

Python library for reading and writing collada documents

https://pycollada.readthedocs.org/