I have some .pl
file and I want to call predicate declared in it from python script. How can I do that?
For example, test.pl
rD( [], Ans, Ans ).
rD( [X|Xs], Ans, Acc ) :-
member( X, Acc ),
rD( Xs, Ans, Acc ), !.
rD( [X|Xs], Ans, Acc ) :-
\+member( X, Acc ),
append( Acc, [X], AccNew ),
rD( Xs, Ans, AccNew ), !.
Working like
?- rD( [1,2,3,4,5,4], X ).
X = [1, 2, 3, 4, 5].
I want to call rD
somehow from python script and get answer in result variable
result
[1, 2, 3, 4, 5]
ps: it is just an example, and I don't want to rewrite my current Prolog program.
TLDR: installing SWI-Prolog and pip install pyswip should do the job, for both Python 2 and 3. Show activity on this post. Since you don't want to "rewrite my current Prolog program," I think the natural approach is to make an external call from Python to SWI-Prolog, passing appropriate command line arguments.
Prolog is a Logic-based Programming Language, while Python is an Interpreted Programming Language.
Not that I have a direct experience with it, but there is a project called PySWIP that provides a bridge between Python and SWI-Prolog. The wiki hosted on Google Code's project pages holds installation instructions and some usage examples.
EDIT (5th of July 2019)
PySWIP now seems to be maintained on Github, with its own installation instructions. TLDR: installing SWI-Prolog and pip install pyswip
should do the job, for both Python 2 and 3.
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