code: def _wait_output(popen, is_slow):
      
      proc = Process(popen.pid)
      try:
          proc.wait(settings.wait_slow_command if is_slow
                    else settings.wait_command)
          return True
      except TimeoutExpired:
          for child in proc.children(recursive=True):
              _kill_process(child)
          _kill_process(proc)
          return False
docs: Returns `True` if we can get output of the command in the
      `settings.wait_command` time.
  
      Command will be killed if it wasn't finished in the time.
  
      :type popen: Popen
      :rtype: bool