How to use the tts.SaveType function in TTS

def file_list_has_changed(self,now):
    if not now:
      return
    ident=self.file_store[now[0]]
    filename=self.filesystem.get_json_filename_for_type(ident,self.save_type.get())
    data=tts.load_json_file(filename)
    # TODO: error handling
    self.save=tts.Save(savedata=data,
                       ident=ident,
                       filename=filename,
                       save_type=tts.SaveType(self.save_type.get()),
                       filesystem=self.filesystem)
    if self.save.isInstalled:
      self.downloadButton.configure(text="All files Downloaded",
                                    state=Tk.DISABLED)
      self.exportButton.configure(text="Export",state=Tk.NORMAL)
    else:
      self.downloadButton.configure(text="Download missing files",
                                    state=Tk.NORMAL)
      self.exportButton.configure(text="Download and Export",
                                  state=Tk.NORMAL)

def do_download(self,args):
    successful=True
    if not args.all:
      if not args.save_type:
        args.save_type=self.filesystem.get_json_filename_type(args.id)
      if not args.save_type:
        return 1,"Unable to determine type of id %s" % args.id
      successful = tts.download_file(self.filesystem,args.id,args.save_type)
    else:
      if args.save_type:
        for ident in self.filesystem.get_filenames_by_type(args.save_type):
          if not tts.download_file(self.filesystem,ident,args.save_type):
            successful=False
            break
      else:
        for save_type in tts.SaveType:
          for ident in self.filesystem.get_filenames_by_type(save_type):
            if not tts.download_file(self.filesystem,ident,save_type):
              successful=False
              break

    if successful:
      return 0, "All files downloaded."
    else:
      return 1, "Some files failed to download."

def file_list_has_changed(self,now):
    if not now:
      return
    ident=self.file_store[now[0]]
    filename=self.filesystem.get_json_filename_for_type(ident,self.save_type.get())
    data=tts.load_json_file(filename)
    # TODO: error handling
    self.save=tts.Save(savedata=data,
                  ident=ident,
                  filename=filename,
                  save_type=tts.SaveType(self.save_type.get()),
                  filesystem=self.filesystem)
    if self.save.isInstalled:
      self.status_label.config(text="All files found.")
    else:
      self.status_label.config(text="Some cache files missing - check details on list page.")
    self.file_list.event_generate("<>")