Python-多进程 Fork 异常

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Python 解决多进程 Fork 异常。

问题：

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objc[2483]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.
objc[2483]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.

解决：

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vim ~/.bash_profile 
OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
source ~/.bash_profile