code: def get_readable_web_pdf(self):
          ''' getter '''
          if isinstance(self.__readable_web_pdf, ReadableWebPDF) is False and self.__readable_web_pdf is not None:
              raise TypeError("The type of __readable_web_pdf must be ReadableWebPDF.")
          return self.__readable_web_pdf get_readable_web_pdf(self):
          ''' getter '''
          if isinstance(self.__readable_web_pdf, ReadableWebPDF) is False and self.__readable_web_pdf is not None:
              raise TypeError("The type of __readable_web_pdf must be ReadableWebPDF.")
          return self.__readable_web_pdf
docs: getter