python最易用的并发处理--multiprocessing.Pool进程池及ThreadPool线程池
https://www.douban.com/note/536557310/
16.6. multiprocessing — Process-based “threading” interface
https://docs.python.org/2/library/multiprocessing.html
https://www.douban.com/note/536557310/
16.6. multiprocessing — Process-based “threading” interface
https://docs.python.org/2/library/multiprocessing.html