Python——multiprocessing报错：TypeError: cannot pickle ‘_thread.lock‘ object

多进程报错

Traceback (most recent call last):
  File "C:\Users\miaochangbin\PycharmProjects\eduCrawler\main.py", line 138, in <module>
    p.start()
  File "D:\Program Files\python\lib\multiprocessing\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "D:\Program Files\python\lib\multiprocessing\context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "D:\Program Files\python\lib\multiprocessing\context.py", line 327, in _Popen
    return Popen(process_obj)
  File "D:\Program Files\python\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
    reduction.dump(process_obj, to_child)
  File "D:\Program Files\python\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
TypeError: cannot pickle '_thread.lock' object

原因

• 在启动子进程时，会将所有输入参数经过信息序列化后传递到子进程中，而报错就是在信息进行序列化时候。
• 而这边信息报错传递子进程的对象信息（属性以及属性的属性）。
• 因此：说明代码中有类或者对象无法被序列化，但是被传入子进程中，去除对应无法实例化的代码，或者将其放在子进程中初始化即可。

参考文章：

• 多进程 报错 TypeError: cannot pickle ‘_thread.lock‘ object