code: def image_cache(article_cache, img_dir):
      
      log.debug('Looking for image directory in the cache')
      if os.path.isdir(article_cache):
          log.info('Cached image directory found: {0}'.format(article_cache))
          shutil.copytree(article_cache, img_dir)
          return True
      return False
docs: The method to be used by get_images() for copying images out of the cache.