code: def start_processing(self, message, steps=0, warning=True):
          
  
          if self.__is_processing:
              warning and LOGGER.warning(
                  "!> {0} | Engine is already processing, 'start_processing' request has been ignored!".format(
                      self.__class__.__name__))
              return False
  
          LOGGER.debug("> Starting processing operation!")
  
          self.__is_processing = True
          self.Application_Progress_Status_processing.Processing_progressBar.setRange(0, steps)
          self.Application_Progress_Status_processing.Processing_progressBar.setValue(0)
          self.Application_Progress_Status_processing.show()
          self.set_processing_message(message)
          return True
docs: Registers the start of a processing operation.
  
          :param message: Operation description.
          :type message: unicode
          :param steps: Operation steps.
          :type steps: int
          :param warning: Emit warning message.
          :type warning: int
          :return: Method success.
          :rtype: bool