code: def Page(QLExportable):
    ''' For multi-page files, e.g. if pdf preview '''
    def __init__(self, filename, page_id):
      self.id = page_id
      super(Page, self).__init__(filename)
  
    def export(self, export_format=ExportFormat.PNG):
      pasf Page(QLExportable):
    ''' For multi-page files, e.g. if pdf preview '''
    def __init__(self, filename, page_id):
      self.id = page_id
      super(Page, self).__init__(filename)
  
    def export(self, export_format=ExportFormat.PNG):
      pass
docs: For multi-page files, e.g. if pdf preview