A Short History of the GPGME bindings for Python
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Overview
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Version:
0.0.1
GPGME Version:
1.13.0
Author:
Ben McGinnes <ben@gnupg.org>
Author GPG Key:
DB4724E6FA4286C92B4E55C4321E4E2373590E5D
Language:
Australian English, British English
xml:lang:
en-AU, en-GB, en

The GPGME Python bindings passed through many hands and numerous phases before, after a fifteen year journey, coming full circle to return to the source.  This is a short explanation of that journey.

In the beginning
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In 2002 John Goerzen released PyME; Python bindings for the GPGME module which utilised the current release of Python of the time and SWIG. (In all likelihood this would have been Python 2.2 or possibly Python 2.3.)  Shortly after creating it and ensuring it worked he stopped supporting it, though he left his work available on his Gopher site.

Keeping the flame alive
=======================

A couple of years later the project was picked up by Igor Belyi and actively developed and maintained by him from 2004 to 2008.  Igor's whereabouts at the time of this document's creation are unknown, but the current authors do hope he is well.  We're assuming (or hoping) that life did what life does and made continuing untenable.

Passing the torch
=================

In 2014 Martin Albrecht wanted to patch a bug in the PyME code and discovered the absence of Igor.  Following a discussion on the PyME mailing list he became the new maintainer for PyME, releasing version 0.9.0 in May of that year.  He remains the maintainer of the original PyME release in Python 2.6 and 2.7 (available via PyPI).

Coming full circle
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In 2015 Ben McGinnes approached Martin about a Python 3 version, while investigating how complex a task this would be the task ended up being completed.  A subsequent discussion with Werner Koch led to the decision to fold the Python 3 port back into the original GPGME release in the languages subdirectory for non-C bindings under the module name of pyme3.

In 2016 this PyME module was integrated back into the GPGME project by Justus Winter.  During the course of this work Justus adjusted the port to restore limited support for Python 2, but not as many minor point releases as the original PyME package supports.  During the course of this integration the package was renamed to more accurately reflect its status as a component of GPGME.  The pyme3 module was renamed to gpg and adopted by the upstream GnuPG team.

In 2017 Justus departed G10code and the GnuPG team.  Following this Ben returned to maintain of gpgme Python bindings and continue building them from that point.

Relics of the past
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There are a few things, in addition to code specific factors, such as SWIG itself, which are worth noting here.

The Annoyances of Git
=====================

As anyone who has ever worked with git knows, submodules are horrible way to deal with pretty much anything.  In the interests of avoiding migraines, that was skipped with addition of the PyME code to GPGME.

Instead the files were added to a subdirectory of the lang/ directory, along with a copy of the entire git log up to that point as a separate file within the lang/python/docs/ directory. (The entire PyME git log and other preceding VCS logs are located in the gpgme/lang/python/docs/old-commits.log file.) As the log for PyME is nearly 100KB and the log for GPGME is approximately 1MB, this would cause considerable bloat, as well as some confusion, should the two be merged.

Hence the unfortunate, but necessary, step to simply move the files.  A regular repository version has been maintained should it be possible to implement this better in the future.

The Perils of PyPI
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The early port of the Python 2 pyme module as pyme3 was never added to PyPI while the focus remained on development and testing during 2015 and early 2016.  Later in 2016, however, when Justus completed his major integration work and subsequently renamed the module from pyme3 to gpg, some prior releases were also provided through PyPI.

Since these bindings require a matching release of the GPGME libraries in order to function, it was determined that there was little benefit in also providing a copy through PyPI since anyone obtaining the GPGME source code would obtain the Python bindings source code at the same time.  Whereas there was the potential to sew confusion amongst Python users installing the module from PyPI, only to discover that without the relevant C files, header files or SWIG compiled binaries, the Python module did them little good.

There are only two files on PyPI which might turn up in a search for this module or a sample of its content:

 1. gpg (1.8.0) - Python bindings for GPGME GnuPG cryptography library

 2. pyme (0.9.0) - Python support for GPGME GnuPG cryptography library

GPG 1·8·0 - Python bindings for GPGME GnuPG cryptography library
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This is the most recent version to reach PyPI and is the version of the official Pyhon bindings which shipped with GPGME 1.8.0.  If you have GPGME 1.8.0 installed and only 1.8.0 installed, then it is probably safe to use this copy from PyPI.

As there have been a lot of changes since the release of GPGME 1.8.0, the GnuPG Project recommends not using this version of the module and instead installing the current version of GPGME along with the Python bindings included with that package.

PyME 0·9·0 - Python support for GPGME GnuPG cryptography library
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This is the last release of the PyME bindings maintained by Martin Albrecht and is only compatible with Python 2, it will not work with Python 3.  This is the version of the software from which the port from Python 2 to Python 3 code was made in 2015.

Users of the more recent Python bindings will recognise numerous points of similarity, but also significant differences.  It is likely that the more recent official bindings will feel "more pythonic."

For those using Python 2, there is essentially no harm in using this module, but it may lack a number of more recent features added to GPGME.