python启动多进程时,may have been in progress in another thread when fork() was called。

解决方法:
pycharm中 -- 点击run -- Edit Configurations... -- 修改Environment varibles为OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
-- 保存
参考 : https://blog.csdn.net/weixin_30929195/article/details/96524364
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