def _get_config_fname():
 directory = _get_vispy_app_dir()
 if (directory is None):
  return None
 fname = op.join(directory, 'vispy.json')
 if (os.environ.get('_VISPY_CONFIG_TESTING', None) is not None):
  fname = op.join(_TempDir(), 'vispy.json')
 return fname

def _get_config_fname ( ) : directory = _get_vispy_app_dir ( ) if ( directory is None ) : return None fname = op . join ( directory , 'vispy.json' ) if ( os . environ . get ( '_VISPY_CONFIG_TESTING' , None ) is not None ) : fname = op . join ( _TempDir ( ) , 'vispy.json' ) return fname
helper for the vispy config file .