High-performance Python framework for building cloud APIs

https://falconframework.org/

Python package that provides useful locks

https://github.com/harlowja/fasteners

Fastimport parser and generator in Python

https://github.com/jelmer/python-fastimport

Fastest Python implementation of JSON schema

https://horejsek.github.io/python-fastjsonschema/

Universal feed parser written in Python

https://github.com/kurtmckee/feedparser

Python port from filetype Go package

https://github.com/h2non/filetype.py

Finds the libpython associated with your environment

https://github.com/ktbarrett/find_libpython

Fixtures, reusable state for writing clean tests and more

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

Code checking using pep8 and pyflakes

https://pypi.org/project/flake8/

Plugin for nose or pytest that automatically reruns flaky tests

https://github.com/box/flaky

FlatBuffers serialization format for Python

https://google.github.io/flatbuffers/

Distribution-building parts of Flit

https://flit.pypa.io/en/stable/ https://github.com/pypa/flit/tree/main/flit_core

PEP 518 build backend that uses setuptools_scm to generate a version file

https://gitlab.com/WillDaSilva/flit_scm

API for detecting the original bouncing email addresses from a bounce message

https://fluflbounce.readthedocs.io

High-level API for Python internationalization

https://flufli18n.readthedocs.io

NFS-safe file locking with timeouts for POSIX systems

https://flufllock.readthedocs.io

Random assortment of WSGI servers

https://bitbucket.org/denisenkom/flup

Font version reporting and modification tool

https://github.com/source-foundry/font-v

Set of objects for performing math operations on font data

https://github.com/robotools/fontMath

Python library for manipulating OpenType font features

https://github.com/simoncozens/fontFeatures

API for interacting with the parts of fonts during the font development process

https://github.com/robotools/fontParts

Collection of classes implementing the pen protocol for manipulating glyphs

https://github.com/robotools/fontPens

Open source library for manipulating fonts, written in Python

https://github.com/fonttools/fonttools

Open source library for manipulating fonts, written in Python

https://github.com/fonttools/fonttools

Simple PDF generation for Python

https://code.google.com/p/pyfpdf/

Let your Python tests travel through time

https://github.com/spulec/freezegun

Python filesystem abstraction

https://pyfilesystem.org/

Python Filesystem abstraction layer, version 2.x

https://www.pyfilesystem.org/

File-system specification

https://filesystem-spec.readthedocs.io/en/latest/ https://github.com/fsspec/filesystem_spec

XRootD implementation for fsspec

https://coffeateam.github.io/fsspec-xrootd/ https://github.com/CoffeaTeam/fsspec-xrootd

High-level FTP client library

https://ftputil.sschwarzer.net/

Python function signatures from PEP362

http://funcsigs.readthedocs.org/

Clean single-source support for Python 3 and 2

https://python-future.org/

AST that abstracts the underlying Python version

https://github.com/serge-sans-paille/gast

Python binding for GDAL

https://gdal.org/ https://github.com/OSGeo/gdal

Python bindings to the GNU dbm library

Python's Encoder/decoder for simple GIS features

https://pypi.org/project/geojson/

Python co-routine networking library based on greenlet

https://www.gevent.org/ https://python-gevent.readthedocs.io/ https://github.com/gevent/gevent

Python API for evaluating language support in the Google Fonts collection

https://github.com/googlefonts/lang

Codepoint definitions for the Google Fonts subsetter

https://github.com/googlefonts/nam-files

Copy your docs directly to the gh-pages branch

https://github.com/c-w/ghp-import

Documentation generator for GObject-based libraries

https://gitlab.gnome.org/GNOME/gi-docgen

Git Object Database

https://gitdb.readthedocs.io/en/latest/ https://github.com/gitpython-developers/gitdb

Python Git Library

https://github.com/gitpython-developers/GitPython

Git URL parsing module

https://github.com/nephila/giturlparse

Bridge from Glyphs source files (.glyphs) to UFOs

https://github.com/googlefonts/glyphsLib

Routines for extracting information from fontTools glyphs

https://github.com/simoncozens/glyphtools

Common protobufs used in Google APIs

https://github.com/googleapis/python-api-common-protos

GraphQL implementation for Python

https://github.com/graphql-python/graphql-core-next

Simple Python interface for Graphviz

https://github.com/xflr6/graphviz