code: def print_stats(self):
          
          print(
              "{0:-<48}".format(str(datetime.now().strftime('%Y-%m-%d %H:%M '))))
          print("{0:<40} {1:>7}".format("Sources checked:", self.sources))
          print("{0:<40} {1:>7}".format(
              "Source references deleted from DB:", self.source_refs_deleted))
          print("{0:<40} {1:>7}".format("Thumbnails deleted from disk:",
                                      self.thumbnails_deleted))
          print("(Completed in %s seconds)\n" % self.execution_time)
docs: Print statistics about the cleanup performed.