4 library(janus): Call Python from Prolog
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Availability::- use_module(library(janus)).(can be autoloaded)
Sourcepy_shell
Start an interactive Python REPL loop using the embedded Python interpreter. The interpreter first imports janus as below. 
from janus import *

So, we can do 

?- py_shell.
...
>>> query_once("writeln(X)", {"X":"Hello world"})
Hello world
{'truth': True}

If possible, we enable command line editing using the GNU readline library.

When used in an environment where Prolog does not use the file handles 0,1,2 for the standard streams, e.g., in swipl-win, Python's I/O is rebound to use Prolog's I/O. This includes Prolog's command line editor, resulting in a mixed history of Prolog and Pythin commands.