code: def start(self):
          
          error, output = None, None
          try:
              time.sleep(0.1)
              output = self.method(*self.args, **self.kwargs)
          except Exception as err:
              logger.debug(str((self.method.__module__, self.method.__name__,
                                err)))
              error = str(err)
              error = error.replace('(', '')
              error = error.replace(')', '')
  #            try:
  #                error = err[0]
  #            except Exception:
  #                try:
  #                    error = err.message
  #                except Exception as err2:
  #                    error = ''
  
          self.sig_finished.emit(self, output, str(error))
          self._is_finished = True
docs: Start the worker process.