Python多进程：无法腌制本地对象'_createenviron。<locals> .encodekey'

Question

我正在使用python3.6current.futures lib，出现以下错误，有人可以帮帮我吗？非常感谢！ （最初，我使用多线程，尽管程序正常运行，我尝试切换到多进程，但发生错误...）

Traceback (most recent call last):
  File "C:\Program Files\Python36\lib\multiprocessing\queues.py", line 241, in _feed
    obj = _ForkingPickler.dumps(obj)
  File "C:\Program Files\Python36\lib\multiprocessing\reduction.py", line 51, in dumps
    cls(buf, protocol).dump(obj)
AttributeError: Can't pickle local object '_createenviron.<locals>.encodekey'
Process finished with exit code 1