4 library(janus): Call Python from Prolog
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      • SWI-Prolog Python interface
        • library(janus): Call Python from Prolog
          • py_version/0
          • py_call/1
          • py_call/2
          • py_call/3
          • py_iter/2
          • py_iter/3
          • py_setattr/3
          • py_is_object/1
          • py_is_dict/1
          • py_free/1
          • py_with_gil/1
          • py_gil_owner/1
          • py_func/3
          • py_func/4
          • py_dot/3
          • py_dot/4
          • values/3
          • keys/2
          • key/2
          • items/2
          • py_shell/0
          • py_pp/1
          • py_pp/2
          • py_pp/3
          • py_object_dir/2
          • py_object_dict/2
          • py_obj_dir/2
          • py_obj_dict/2
          • py_type/2
          • py_isinstance/2
          • py_module_exists/1
          • py_hasattr/2
          • py_import/2
          • py_module/2
          • py_initialize/3
          • py_lib_dirs/1
          • py_add_lib_dir/1
          • py_add_lib_dir/2
          • Handling Python errors in Prolog
          • Calling and data translation errors
          • Janus and virtual environments (venv)
Availability::- use_module(library(janus)).(can be autoloaded)
Source[det]py_initialize(+Program, +Argv, +Options)
Initialize and configure the embedded Python system. If this predicate is not called before any other call to Python such as py_call/2, it is called lazily, passing the Prolog executable as Program, passing Argv from the Prolog flag py_argv and an empty Options list.

Calling this predicate while the Python is already initialized is a no-op. This predicate is thread-safe, where the first call initializes Python.

In addition to initializing the Python system, it

  • Adds the directory holding janus.py to the Python module search path.
  • If Prolog I/O is not connected to the file handles 0,1,2, it rebinds Python I/O to use the Prolog I/O.
Options is currently ignored. It will be used to provide additional configuration options.