pyparsing

Python parsing module

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Project description

====================================
PyParsing -- A Python Parsing Module
====================================

Introduction
============

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. The pyparsing module provides a library of classes
that client code uses to construct the grammar directly in Python code.

Here is a program to parse "Hello, World!" (or any greeting of the form
"<salutation>, <addressee>!"):

from pyparsing import Word, alphas
greet = Word( alphas ) + "," + Word( alphas ) + "!"
hello = "Hello, World!"
print hello, "->", greet.parseString( hello )

The program outputs the following:

Hello, World! -> ['Hello', ',', 'World', '!']

The Python representation of the grammar is quite readable, owing to the
self-explanatory class names, and the use of '+', '|' and '^' operator
definitions.

The parsed results returned from parseString() can be accessed as a
nested list, a dictionary, or an object with named attributes.

The pyparsing module handles some of the problems that are typically
vexing when writing text parsers:
- extra or missing whitespace (the above program will also handle
"Hello,World!", "Hello , World !", etc.)
- quoted strings
- embedded comments

The .zip file includes examples of a simple SQL parser, simple CORBA IDL
parser, a config file parser, a chemical formula parser, and a four-
function algebraic notation parser. It also includes a simple how-to
document, and a UML class diagram of the library's classes.

Installation
============

Do the usual:

python setup.py install

(pyparsing requires Python 2.6 or later.)

Or corresponding commands using pip, easy_install, or wheel:

pip install pyparsing

easy_install pyparsing

wheel install pyparsing

Documentation
=============

See:

HowToUsePyparsing.html

License
=======

MIT License. See header of pyparsing.py

History
=======

See CHANGES file.

Project details

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3.2.0

Oct 13, 2024

3.2.0rc1 pre-release

Oct 5, 2024

3.2.0b3 pre-release

Sep 29, 2024

3.2.0b2 pre-release

Sep 24, 2024

3.2.0b1 pre-release

Sep 12, 2024

3.1.4

Aug 25, 2024

3.1.3

Aug 25, 2024

3.1.2

Mar 6, 2024

3.1.1

Jul 30, 2023

3.1.0

Jun 18, 2023

3.1.0b2 pre-release

May 20, 2023

3.1.0b1 pre-release

Apr 8, 2023

3.1.0a1 pre-release

Mar 8, 2023

3.0.9

May 10, 2022

3.0.8

Apr 10, 2022

3.0.7

Jan 21, 2022

3.0.6

Nov 12, 2021

3.0.5

Nov 7, 2021

3.0.4

Oct 30, 2021

3.0.3

Oct 27, 2021

3.0.2

Oct 27, 2021

3.0.1

Oct 24, 2021

3.0.0

Oct 23, 2021

3.0.0rc2 pre-release

Oct 2, 2021

3.0.0rc1 pre-release

Sep 9, 2021

3.0.0b3 pre-release

Aug 8, 2021

3.0.0b2 pre-release

Dec 30, 2020

3.0.0b1 pre-release

Nov 3, 2020

3.0.0a2 pre-release

Jun 28, 2020

3.0.0a1 pre-release

Apr 5, 2020

2.4.7

Apr 5, 2020

2.4.6

Dec 25, 2019

2.4.5

Nov 10, 2019

2.4.4

Nov 5, 2019

2.4.3

Nov 5, 2019

2.4.2

Jul 30, 2019

2.4.2a1 pre-release

Jul 24, 2019

2.4.1.1

Jul 25, 2019

2.4.0

Apr 8, 2019

2.3.1

Jan 13, 2019

2.3.0

Oct 31, 2018

2.2.2

Sep 30, 2018

2.2.1

Sep 18, 2018

2.2.0

Mar 6, 2017

2.1.10

Oct 7, 2016

2.1.9

Sep 10, 2016

2.1.8

Aug 15, 2016

2.1.7

Aug 11, 2016

2.1.6

Aug 8, 2016

2.1.5

Jun 13, 2016

2.1.4

May 13, 2016

2.1.3

May 11, 2016

2.1.2

May 11, 2016

2.1.1

Mar 22, 2016

This version

2.1.0

Feb 7, 2016

2.0.7

Dec 31, 2015

2.0.6

Nov 14, 2015

2.0.5

Oct 29, 2015

2.0.4

Oct 29, 2015

2.0.3

Oct 11, 2014

2.0.2

Apr 13, 2014

2.0.1

Jul 17, 2013

2.0.0

Dec 16, 2012

1.5.7

Dec 16, 2012

1.5.6

Jun 28, 2011

1.5.5

Aug 12, 2010

1.5.4

Aug 11, 2010

1.5.3

May 25, 2010

1.5.2

Apr 19, 2009

1.5.1

Oct 18, 2008

1.5.0

Jun 1, 2008

1.4.11

Feb 11, 2008

1.4.8

Oct 7, 2007

1.4.7

Jul 22, 2007

1.4.6

Apr 12, 2007

1.3.3

Sep 13, 2005

1.2

Jun 29, 2004

1.1.2

Mar 20, 2004

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