windows平台下的python的multiprocessing、ProcessPoolExecutor操作需要在if __name__ == ‘__main__‘代码块中进行

例如一个模块 mylibrary.py

# mylibrary.py

from multiprocessing import Process

class MyProcess(Process):
    def run(self):
        print "Hello from the new process"

def foo():
    p = MyProcess()
    p.start()

你要在main.py 中引用这个模块

# main.py

import mylibrary

mylibrary.foo()

在Linux平台可以正常运行，但在windows平台上按照你预想的方式运行
需要 if name == ‘main’，像这样

import mylibrary

if __name__ == "__main__":
    mylibrary.foo()

具体原因可以参考：
https://stackoverflow.com/questions/14175348/why-does-pythons-multiprocessing-module-import-main-when-starting-a-new-pro

https://stackoverflow.com/questions/38801229/why-processpoolexecutor-on-windows-needs-main-guard-when-submitting-function