异步进程池

import os
from multiprocessing import Pool
demo = 'this is a test'

def func():
 with open('text.txt', 'w') as f:
     f.write(demo)
 print('process {} write success'.format(os.getpid()))

if __name__ == '__main__':
 p = Pool(5)
 for i in range(100):
     # 异步，可以设置回调函数
     p1 = p.apply_async(func)
 p.close()
 p.join()