code: def get_stdout(self, tail=None):
          
          if self.finished(): 
              self.join_threads()
          while not self.stdout_q.empty():
              self.stdout_l.append(self.stdout_q.get_nowait())
          if tail is None:
              tail = len(self.stdout_l)
          return _py2_and_3_joiner('\n', self.stdout_l[:tail])
docs: Returns current total output written to standard output.
          :param tail: Return this number of most-recent lines.
          :return: copy of stdout stream