code: def get(self, timeout=None):
          
          valid = False
          result = None
          for tube in self._output_tubes:
              if timeout:
                  valid, result = tube.get(timeout)
                  if valid:
                      result = result[0]
              else:
                  result = tube.get()[0]
          if timeout:
              return valid, result
          return result
docs: Retrieve results from all the output tubes.