code: def get_filetypes(self):
          # type: () -> List[str]
          
          if not self.is_requestable():
              return [resource.get_file_type() for resource in self.get_resources()]
          return self._get_stringlist_from_commastring('file_types')
docs: Return list of filetypes in your data
  
          Returns:
              List[str]: List of filetypes