Return the fortran library, loaded with

def _load_library(self):
        """Return the fortran library, loaded with """
        path = self._library_path()
        logger.info("Loading library from path {}".format(path))
        library_dir = os.path.dirname(path)
        if platform.system() == 'Windows':
            import win32api
            olddir = os.getcwd()
            os.chdir(library_dir)
            win32api.SetDllDirectory('.')

        result = cdll.LoadLibrary(path)

        if platform.system() == 'Windows':
            os.chdir(olddir)

        return result