Welcome to the PLY homepage. PLY is an implementation of lex and yacc parsing tools for Python. If you don't have the slightest idea what that means, you're probably in the wrong place. Otherwise, keep reading.
In a nutshell, PLY is nothing more than a straightforward lex/yacc implementation. Here is a list of its essential features:
4/26/2015. PLY-3.6 is released. A fair bit of cleanup and a few new features. Note: PLY-3.5 had some critical bugs and has been withdrawn.
2/17/2011. PLY-3.4 is released. Minor bug fixes for Python 3.2
9/2/2009. PLY-3.3 is released. This is a minor bug-fix release.
3/24/2009. PLY-3.2 is released. This is just a minor bug-fix release for the PLY-3.x series.
2/28/2009. PLY-3.1 is released. This is just a minor bug-fix release to PLY-3.0.
2/6/2009. PLY-3.0 is released. This release adds support for Python 2.6 and 3.0. In addition, huge parts of PLY's internals have been refactored to simplify maintenance and further expansion.
5/28/2008. PLY-2.5 is released. This release fixes a number of outstanding bugs, provides improved error handling, and may run even faster than Ply-2.3. Note: The PLY-2.4 release was withdrawn due to a critical error. Please upgrade to PLY-2.5 if you downloaded that version.
2/19/2007. PLY-2.3 is released. This release makes some performance improvements and fixes a bug with start conditions in the lexer.
11/21/2006. The PLY source code repository is now available on Google Code.
11/1/2006. PLY-2.2 is released. This release includes some minor bug fixes and some enhancements to the lex module.
10/2/2006. PLY-2.1 is released. This release features a variety of major improvements including an overhaul of the lexer, new parsing features such as support for inherited attributes, embedded actions, and character literals, improved packaging, and new examples.
9/15/2006. ply-hack, a Google group dedicated to PLY has been launched.
9/8/2006. PLY-2.0 is released. This is the most significant PLY release in several years. Features a completely new implementation of the LALR(1) table generator that is not only faster, but which also seems to produces correct results! If you experienced problems with LALR(1) parsing in PLY-1.x releases, you definitely want to download this version. Note: PLY-2.0 is the first in a series of releases that will be adding significant new features to PLY.
8/2/2006. PLY-1.8 is released. This release fixes a very subtle parsing bug with LALR(1) parsing. Update (8/9/2006): there is still a weird bug in LALR(1) parsing. Please download version 2.0 instead.
5/24/2006. PLY-1.7 is released. This release fixes a number of subtle bugs and adds better support for Unicode.
5/27/2005. PLY-1.6 is released. This release includes a much-awaited patch to fix problems with LALR(1) parsing. Contributed by Christopher Stawarz.
6/1/2004. PLY-1.5 is released. This releases includes full LALR(1) support (contributed by Elias Ioup). Check it out!
4/23/2004. PLY-1.4 is released. This includes some nice usability enhancements to the output files and cleans up a few things.
2/1/2003. PLY-1.3.1 is released. Patch to fix a minor (but critical) typo in precedence checking code.
12/12/2002. PLY-1.3 is released. Minor bugs fixes.
11/27/2002. PLY-1.2 is released. This release contains a few bug fixes, improvements to support Python's optimize mode, and better state management.
10/25/2001. PLY-1.1 is released. This release contains a few bug fixes and minor improvements.
6/18/2001. PLY-1.0 released.
The following people have made various contributions to PLY in the form of bug reports, feature requests, and patches.