[det]py_add_lib_dir(+Dir)first or last. py_add_lib_dir/1
adds the directory as last. The property sys:path
is not modified if it already contains Dir.
Dir is in Prolog notation. The added directory is converted to an absolute path using the OS notation using prolog_to_os_filename/2.
If Dir is a relative path, it is taken relative to Prolog source file when used as a directive and relative to the process working directory when called as a predicate.