PySWIP 0.1.3 released

[yuce]

I am pleased to announce the 0.1.3 version of PySWIP.

PySWIP is a GPL'd Python - SWI-Prolog bridge which enables querying
SWI-Prolog in your Python programs.

PySWIP includes both an (incomplete) SWI-Prolog foreign language
interface and a utity class that makes it easy querying SWI-Python.
Since it uses SWI-Prolog as a shared library and ctypes to access it,
PySWIP doesn't require compilation to be installed.

This version breaks the compatibility with previous versions.

Example:
    >>> from pyswip.prolog import Prolog
    >>> prolog = Prolog()
    >>> prolog.assertz("father(michael,john)")
    [{}]
    >>> prolog.assertz("father(michael,gina)")
    [{}]
    >>> list(prolog.query("father(michael,X)"))
    [{'X': 'john'}, {'X': 'gina'}]
    >>> for soln in prolog.query("father(X,Y)"):
    ...     print soln["X"], "is the father of", soln["Y"]
    ...
    michael is the father of john
    michael is the father of gina

Foreign Functions Example:

Since version 0.1.3 of PySWIP, it is possible to register a Python
function as a Prolog predicate through SWI-Prolog's Foreign Function
Interface.
Here's an example:

    from pyswip.prolog import Prolog
    from pyswip.easy import registerForeign, getAtomChars

    def hello(t):
        print "Hello,", getAtomChars(t)
        return True
    hello.arity = 1

    registerForeign(hello)
    prolog = Prolog()
    prolog.assertz("father(michael,john)")
    prolog.assertz("father(michael,gina)")
    list(prolog.query("father(michael,X), hello(X)"))

Outputs:
    Hello, john
    Hello, gina

Requirements:
* Python 2.3 and higher.
* ctypes 0.9.9.9 and higher.
* SWI-Prolog 5.6.x and higher (most probably other versions will also
work).
* libpl as a shared library.
* Works on Linux and Win32, should work for all POSIX.

Changes since version 0.1.2:
  * Renamed `pyswip/util.py` to `pyswip/prolog.py`.
  * New module `pyswip.easy`.
  * Now it is possible to register a Python function as a Prolog
predicate through SWI-Prolog's Foreign Function Interface.
  * Additions to the core library.
  * Added example, *register foreign* which shows how to register a
Python function as an SWI-Prolog predicate.
  * Added example, *Towers of Hanoi*

PySWIP homepage is at: http://code.google.com/p/pyswip
Downloads at: http://code.google.com/p/pyswip/downloads/list
Discussion Group is at: http://groups.google.com/group/pyswip

Regards,

Yuce Tekol yucetekol [at] gmail [dot] com>