1March 24, 2009
2
3                  Announcing :  PLY-3.2 (Python Lex-Yacc)
4
5                        http://www.dabeaz.com/ply
6
7I'm pleased to announce a significant new update to PLY---a 100% Python
8implementation of the common parsing tools lex and yacc.  PLY-3.2 adds
9compatibility for Python 2.6 and 3.0, provides some new customization
10options, and cleans up a lot of internal implementation details.
11
12If you are new to PLY, here are a few highlights:
13
14-  PLY is closely modeled after traditional lex/yacc.  If you know how 
15   to use these or similar tools in other languages, you will find
16   PLY to be comparable.
17
18-  PLY provides very extensive error reporting and diagnostic
19   information to assist in parser construction.  The original
20   implementation was developed for instructional purposes.  As
21   a result, the system tries to identify the most common types
22   of errors made by novice users.
23
24-  PLY provides full support for empty productions, error recovery,
25   precedence rules, and ambiguous grammars.
26
27-  Parsing is based on LR-parsing which is fast, memory efficient,
28   better suited to large grammars, and which has a number of nice
29   properties when dealing with syntax errors and other parsing 
30   problems. Currently, PLY can build its parsing tables using 
31   either SLR or LALR(1) algorithms. 
32
33More information about PLY can be obtained on the PLY webpage at:
34
35                   http://www.dabeaz.com/ply
36
37PLY is freely available.
38
39Cheers,
40
41David Beazley (http://www.dabeaz.com)