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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 2.3.2 or later.)
Documentation
=============
See:
HowToUsePyparsing.html
License
=======
MIT License. See header of pyparsing.py
History
=======
See CHANGES file.
1 maintainer
Release files for pyparsing 1.5.7
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Source distributions (sdists)
| File | Size | Uploaded | |
|---|---|---|---|
| pyparsing-1.5.7.zip | 965.0 kB | Details | |
| pyparsing-1.5.7.tar.gz | 939.6 kB | Details |
Built distributions (wheels)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| pyparsing-1.5.7.win32-py2.7.exe | Details | |||
| pyparsing-1.5.7.win32-py2.6.exe | Details | |||
| pyparsing-1.5.7.win32-py2.5.exe | Details |
Total release size: 2.5 MB
Release files / pyparsing-1.5.7.zip
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| Download URL | pyparsing-1.5.7.zip |
|---|---|
| Size | 965.0 kB |
| Tags | Source |
|
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| Download URL | pyparsing-1.5.7.tar.gz |
|---|---|
| Size | 939.6 kB |
| Tags | Source |
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| Download URL | pyparsing-1.5.7.win32-py2.7.exe |
|---|---|
| Size | 231.7 kB |
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| Download URL | pyparsing-1.5.7.win32-py2.6.exe |
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| Size | 231.7 kB |
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