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Pyparsing 1.5.2

Pyparsing 1.5.2 Editors Comment

Free and open source Python parsing module

Pyparsing 1.5.2 Tag

Pyparsing 1.5.2 Description

Free and open source Python parsing module
The Pyparsing module is an alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions. Pyparsing offers a library of classes that the client code uses to construct the grammar directly in Python code. Requirements:
· Python
What's New in This Release: [ read full changelog ]
· Removed __slots__ declaration on ParseBaseException, for
· compatibility with IronPython 2.0.1. Raised by David
· Lawler on the pyparsing wiki, thanks David!
· Fixed bug in SkipTo/failOn handling - caught by eagle eye
· cpennington on the pyparsing wiki!
· Fixed second bug in SkipTo when using the ignore constructor
· argument, reported by Catherine Devlin, thanks!
· Fixed obscure bug reported by Eike Welk when using a class
· as a ParseAction with an errant __getitem__ method.
· Simplified exception stack traces when reporting parse
· exceptions back to caller of parseString or parseFile - thanks
· to a tip from Peter Otten on comp.lang.python.
· Changed behavior of scanString to avoid infinitely looping on
· expressions that match zero-length strings. Prompted by a
· question posted by ellisonbg on the wiki.
· Enhanced classes that take a list of expressions (And, Or,
· MatchFirst, and Each) to accept generator expressions also.
· This can be useful when generating lists of alternative
· expressions, as in this case, where the user wanted to match
· any repetitions of '+', '*', '#', or '.', but not mixtures
of them (that is, match '+++', but not '+-+'):
· codes = "+*#."
· format = MatchFirst(Word(c) for c in codes)
· Based on a problem posed by Denis Spir on the Python tutor
· list.
· Added new example eval_arith.py, which extends the example
· simpleArith.py to actually evaluate the parsed expressions.

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