code: def save_cache(gallery):
      
  
      if hasattr(gallery, "exifCache"):
          cache = gallery.exifCache
      else:
          cache = gallery.exifCache = {}
  
      for album in gallery.albums.values():
          for image in album.images:
              cache[os.path.join(image.path, image.filename)] = image.exif
  
      cachePath = os.path.join(gallery.settings["destination"], ".exif_cache")
  
      if len(cache) == 0:
          if os.path.exists(cachePath):
              os.remove(cachePath)
          return
  
      try:
          with open(cachePath, "wb") as cacheFile:
              pickle.dump(cache, cacheFile)
              logger.debug("Stored cache with %d entries", len(gallery.exifCache))
      except Exception as e:
          logger.warn("Could not store cache: %s", e)
          os.remove(cachePath)
docs: Stores the exif data of all images in the gallery