The Janus
GIT repo provides setup.py. Janus may be installed as a
Python package after downloading using
pip install .
pip allows for installation from the git repository in a
one-liner as below.
pip install git+https://github.com/SWI-Prolog/packages-swipy.git#egg=janus_swi
Installing janus as a Python package requires
- The swipl program in the default search path. The
setup.py runs swipl --dump-runtime-variables
to obtain the installation locations of the various Prolog components.
On Windows, if swipl is not on %PATH%, setup.py
tries the registry to find the default binary installation.
- A C compiler that can be used by pip. The janus interface has
been tested to compile using GCC, Clang and Microsoft Visual C++.
After successful installation we should be able to use Prolog
directly from Python. For example:
python
>>> from janus_swi import *
>>> query_once("writeln('Hello world!')")
Hello world!
{'truth': True}
>>> [a["D"] for a in query("between(1,6,D)")]
[1, 2, 3, 4, 5, 6]
>>> prolog()
?- version.
Welcome to SWI-Prolog (threaded, 64 bits, version 9.1.12-8-g70b70a968-DIRTY)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
...
?-
