code: def _update_python_paths(self):
          
          for path in self._config['workflows'] + self._config['libraries']:
              if os.path.isdir(os.path.abspath(path)):
                  if path not in sys.path:
                      sys.path.append(path)
              else:
                  raise ConfigLoadError(
                      'Workflow directory {} does not exist'.format(path))
docs: Append the workflow and libraries paths to the PYTHONPATH.