python之ProcessPoolExecutor

ProcessPoolExecutor使用上基本与ThreadPoolExecutor一致
不过在windows上使用，有个问题需要注意。使用不当会出现如下错误

File "...\lib\multiprocessing\spawn.py", line 137, in _check_not_importing_main
    is not going to be frozen to produce an executable.''')
RuntimeError:
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

出现这个需要检查多进程代码的调用，看看是不是在

if __name__ == '__main__':
    main()

name检查语句里，如果不在，放在里面就可以了