code: def get_iso_dir():
      
      dirname = os.path.join(get_ugali_dir(),'isochrones')
  
      if not os.path.exists(dirname):
          from ugali.utils.logger import logger
          msg = "Isochrone directory not found:\n%s"%dirname
          logger.warning(msg)
  
      return dirname
docs: Get the ugali isochrone directory.