[Tutor] grammer

[Kent Johnson]

Eric Walker wrote:
> Hello,
> I have been reading about python grammers for processing text files. Does anyone have any simple examples?

Do you mean parsers written in Python for processing text files? A 
grammar is usually an abstract specification of a format, not something 
that will actually process the format.

There are many add-on packages for writing parsers in Python. A good 
list is here:
http://nedbatchelder.com/text/python-parsers.html

IMO pyparsing is one of the easiest to use. It comes with many examples:
http://pyparsing.wikispaces.com/

One of the pyparsing examples parses grammar descriptions in Extended 
Backus-Naur Form (EBNF) and produces a pyparsing parser for the grammar:
http://pyparsing.wikispaces.com/space/showimage/ebnf.py

David Mertz' book Text Processing in Python has many examples:
http://gnosis.cx/TPiP/

HTH
Kent