code: def harvest(self):
          '''Start the harvesting process'''
          if self.perform_initialization() is not None:
              self.process_items()
              self.finalize()
          return self.jof harvest(self):
          '''Start the harvesting process'''
          if self.perform_initialization() is not None:
              self.process_items()
              self.finalize()
          return self.job
docs: Start the harvesting process