非同期プロセスプール

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()