Skip to main content

A simple python library for interacting with SWI-Prologs Pengines

Project description

This is a module for interfacing python with the Prolog Pengines knowledge base.

API

Create a basic run pengine server script, and run it with swipl.

:- use_module(library(http/thread_httpd)).
:- use_module(library(http/http_dispatch)).
:- use_module(library(pengines)).

server(Port) :- http_server(http_dispatch, [port(Port)]).

:- server(4242).

Initialize a basic PengineBuilder

from pengines.Builder import PengineBuilder
from pengines.Pengine import Pengine

pengine_builder = PengineBuilder(urlserver="http://localhost:4242")

Create the pengine querying object.

pengine = Pengine(builder=pengine_builder)
pengine.create()

Make your query – note the lack of ending period – Pengine performs the query like ‘ask(member(X, [1,2,3], [])).’

query = "member(X, [1,2,3])"
pengine.ask(query)
print(pengine.currentQuery.availProofs)

Iterate through the proofs like this:

while pengine.currentQuery.hasMore:
    pengine.doNext(pengine.currentQuery)
    print(pengine.currentQuery.availProofs)

prologterms library

The python library prologterms aims to make it easier to construct prolog programs and query terms from within python.

For an example of how to use prologterms in conjunction with pengines, see:

https://pypi-hypernode.com/project/prologterms/

from pengines.Builder import PengineBuilder
from pengines.Pengine import Pengine
from prologterms import TermGenerator, PrologRenderer, Program, Var

P = TermGenerator()
X = Var('X')
Y = Var('Y')
Z = Var('Z')
R = PrologRenderer()

p = Program(
    P.ancestor(X,Y) <= (P.parent(X,Z), P.ancestor(Z,Y)),
    P.ancestor(X,Y) <= P.parent(X,Y),
    P.parent('a','b'),
    P.parent('b','c'),
    P.parent('c','d')
)

q = P.ancestor(X,Y)

factory = PengineBuilder(urlserver="http://localhost:4242",
                         srctext=R.render(p),
                         ask=R.render(q))
pengine = Pengine(builder=factory, debug=True)
while pengine.currentQuery.hasMore:
    pengine.doNext(pengine.currentQuery)
for p in pengine.currentQuery.availProofs:
    print('{} <- {}'.format(p[X.name], p[Y.name]))

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

pengines-0.1.8.tar.gz (8.1 kB view details)

Uploaded Source

Built Distribution

pengines-0.1.8-py3-none-any.whl (9.2 kB view details)

Uploaded Python 3

File details

Details for the file pengines-0.1.8.tar.gz.

File metadata

  • Download URL: pengines-0.1.8.tar.gz
  • Upload date:
  • Size: 8.1 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? No
  • Uploaded via: twine/1.13.0 pkginfo/1.4.2 requests/2.19.1 setuptools/41.0.1 requests-toolbelt/0.8.0 tqdm/4.23.4 CPython/3.7.1

File hashes

Hashes for pengines-0.1.8.tar.gz
Algorithm Hash digest
SHA256 5325205eaa538f0c02ec886ff5bfd031949e141d0459479817173ec99a6c9d95
MD5 7c3c73c847763602cfae7a4479be5b85
BLAKE2b-256 74a3fd7e21f2d00d6eb6f6a6e932f6479149ce01265f125b203942cdfcac9089

See more details on using hashes here.

File details

Details for the file pengines-0.1.8-py3-none-any.whl.

File metadata

  • Download URL: pengines-0.1.8-py3-none-any.whl
  • Upload date:
  • Size: 9.2 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? No
  • Uploaded via: twine/1.13.0 pkginfo/1.4.2 requests/2.19.1 setuptools/41.0.1 requests-toolbelt/0.8.0 tqdm/4.23.4 CPython/3.7.1

File hashes

Hashes for pengines-0.1.8-py3-none-any.whl
Algorithm Hash digest
SHA256 35ea10b7d2c77757b2a97160298c5d28b4145b00635005647afecdbf5a47763b
MD5 0499d3efac6414e6d3259111b48f5060
BLAKE2b-256 bcdefab4d98642b805839e7d7779780a1c567db61f1a0f8829686b55e1d265f8

See more details on using hashes here.

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page