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  • Python并发编程-concurrent包

    　　　　　　　　　　　　　Python并发编程-concurrent包

    　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　作者：尹正杰

    版权声明：原创作品，谢绝转载！否则将追究法律责任。

    一.concurrent.futures包概述

    　　3.2版本引入的模块。 

    　　异步并行任务编程模块，提供一个高级的异步可执行的便利接口。 

    　　提供了2个池执行器:
　　　　ThreadPoolExecutor 异步调用的线程池的Executor 
    　　　　ProcessPoolExecutor 异步调用的进程池的Executor

    二.ThreadPoolExecutor对象

    1>.首先需要定义一个池的执行器对象，Executor类子类对象。 

    ThreadPoolExecutor(max_workers=1)
　　池中至多创建max_workers个线程的池来同时异步执行，返回Executor实例
    
submit(fn,     *args, **kwargs)
　　提交执行的函数及其参数，返回Future类的实例

    shutdown(wait    =True)
　　清理池

    2>.Future类

    done()
　　如果调用被成功的取消或者执行完成，返回True

    cancelled()
　　如果调用被成功的取消，返回True

    running()
　　如果正在运行且不能被取消，返回True

    cancel()
　　尝试取消调用。如果已经执行且不能取消返回False，否则返回True

    result(timeout    =None)
　　取返回的结果，timeout为None，一直等待返回;timeout设置到期，抛出"concurrent.futures.TimeoutError"异常

    exception(timeout    =None)
　　取返回的异常，timeout为None，一直等待返回;timeout设置到期，抛出"concurrent.futures.TimeoutError"异常

    3>.ThreadPoolExecutor案例实战

     1 #！/usr/bin/env python
 2 #_*_conding:utf-8_*_
 3 #@author :yinzhengjie
 4 #blog:http://www.cnblogs.com/yinzhengjie
 5 
 6 import threading
 7 from concurrent import futures
 8 import logging
 9 import time
10 
11 # 输出格式定义
12 FORMAT = '%(asctime)-15s	 [%(processName)s:%(threadName)s, %(process)d:%(thread)8d] %(message)s'
13 logging.basicConfig(level=logging.INFO, format=FORMAT)
14 
15 def worker(n):
16     logging.info('begin to work-{}'.format(n))
17     time.sleep(5)
18     logging.info('finished {}'.format(n))
19 
20 """
21     线程池并不着急创建线程，用的时候创建，创建后不清除，复用 
22     线程池一旦创建了线程，就不需要频繁清除
23 """
24 executer = futures.ThreadPoolExecutor(max_workers=3)        #创建线程池，池容量为3
25 
26 fs = []
27 for i in range(3):
28     future = executer.submit(worker, i)
29     fs.append(future)
30 
31 for i in range(3, 6):
32     future = executer.submit(worker, i)
33     fs.append(future)
34 
35 while True:
36     time.sleep(2)
37     logging.info(threading.enumerate())
38 
39     flag = True
40     for f in fs:  # 判断是否还有未完成的任务
41         logging.info(f.done())
42         flag = flag and f.done()
43         # if not flag: # 注释了这个if，输出的日志看的清楚些
44         #   break
45     print("-" * 30)
46 
47     if flag:
48         executer.shutdown()
49         logging.info(threading.enumerate())
50         break
    2019-12-04 19:11:33,108     [MainProcess:ThreadPoolExecutor-0_0, 16684:123145346408448] begin to work-0
2019-12-04 19:11:33,108     [MainProcess:ThreadPoolExecutor-0_1, 16684:123145351663616] begin to work-1
2019-12-04 19:11:33,109     [MainProcess:ThreadPoolExecutor-0_2, 16684:123145356918784] begin to work-2
------------------------------
2019-12-04 19:11:35,113     [MainProcess:MainThread, 16684:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(ThreadPoolExecutor-0_0, started daemon 123145346408448)>, <Thread(ThreadPoolExecutor-0_1, started daemon 123145351663616)>, <Thread(ThreadPoolExecutor-0_2, started daemon 123145356918784)>]
2019-12-04 19:11:35,113     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:35,113     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:35,113     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:35,113     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:35,113     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:35,113     [MainProcess:MainThread, 16684:140736847635392] False
------------------------------
2019-12-04 19:11:37,114     [MainProcess:MainThread, 16684:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(ThreadPoolExecutor-0_0, started daemon 123145346408448)>, <Thread(ThreadPoolExecutor-0_1, started daemon 123145351663616)>, <Thread(ThreadPoolExecutor-0_2, started daemon 123145356918784)>]
2019-12-04 19:11:37,114     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:37,114     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:37,114     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:37,114     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:37,114     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:37,114     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:38,111     [MainProcess:ThreadPoolExecutor-0_0, 16684:123145346408448] finished 0
2019-12-04 19:11:38,111     [MainProcess:ThreadPoolExecutor-0_0, 16684:123145346408448] begin to work-3
2019-12-04 19:11:38,111     [MainProcess:ThreadPoolExecutor-0_1, 16684:123145351663616] finished 1
2019-12-04 19:11:38,112     [MainProcess:ThreadPoolExecutor-0_1, 16684:123145351663616] begin to work-4
2019-12-04 19:11:38,112     [MainProcess:ThreadPoolExecutor-0_2, 16684:123145356918784] finished 2
2019-12-04 19:11:38,112     [MainProcess:ThreadPoolExecutor-0_2, 16684:123145356918784] begin to work-5
------------------------------
2019-12-04 19:11:39,115     [MainProcess:MainThread, 16684:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(ThreadPoolExecutor-0_0, started daemon 123145346408448)>, <Thread(ThreadPoolExecutor-0_1, started daemon 123145351663616)>, <Thread(ThreadPoolExecutor-0_2, started daemon 123145356918784)>]
2019-12-04 19:11:39,115     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:39,115     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:39,115     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:39,115     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:39,116     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:39,116     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:41,120     [MainProcess:MainThread, 16684:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(ThreadPoolExecutor-0_0, started daemon 123145346408448)>, <Thread(ThreadPoolExecutor-0_1, started daemon 123145351663616)>, <Thread(ThreadPoolExecutor-0_2, started daemon 123145356918784)>]
2019-12-04 19:11:41,120     [MainProcess:MainThread, 16684:140736847635392] True
------------------------------
2019-12-04 19:11:41,120     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:41,120     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:41,120     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:41,120     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:41,120     [MainProcess:MainThread, 16684:140736847635392] False
2019-12-04 19:11:43,116     [MainProcess:ThreadPoolExecutor-0_2, 16684:123145356918784] finished 5
2019-12-04 19:11:43,116     [MainProcess:ThreadPoolExecutor-0_0, 16684:123145346408448] finished 3
2019-12-04 19:11:43,116     [MainProcess:ThreadPoolExecutor-0_1, 16684:123145351663616] finished 4
2019-12-04 19:11:43,122     [MainProcess:MainThread, 16684:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(ThreadPoolExecutor-0_0, started daemon 123145346408448)>, <Thread(ThreadPoolExecutor-0_1, started daemon 123145351663616)>, <Thread(ThreadPoolExecutor-0_2, started daemon 123145356918784)>]
2019-12-04 19:11:43,122     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:43,122     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:43,122     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:43,122     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:43,122     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:43,122     [MainProcess:MainThread, 16684:140736847635392] True
2019-12-04 19:11:43,123     [MainProcess:MainThread, 16684:140736847635392] [<_MainThread(MainThread, started 140736847635392)>]
------------------------------
    以上代码执行结果戳这里

      

    三.ProcessPoolExecutor对象

     1 #！/usr/bin/env python
 2 #_*_conding:utf-8_*_
 3 #@author :yinzhengjie
 4 #blog:http://www.cnblogs.com/yinzhengjie
 5 
 6 
 7 import threading
 8 from concurrent import futures
 9 import logging
10 import time
11 # 输出格式定义
12 FORMAT = '%(asctime)-15s	 [%(processName)s:%(threadName)s, %(process)d:%(thread)8d] %(message)s'
13 logging.basicConfig(level=logging.INFO, format=FORMAT)
14 
15 def worker(n):
16     logging.info('begin to work-{}'.format(n))
17     time.sleep(5)
18     logging.info('finished {}'.format(n))
19 
20 if __name__ == '__main__':
21     """
22         方法一样。就是使用多进程完成。
23     """
24     executer = futures.ProcessPoolExecutor(max_workers=3)       # 创建进程池，池容量为3
25 
26     fs = []
27     for i in range(3):
28         future = executer.submit(worker, i)
29         fs.append(future)
30 
31     for i in range(3, 6):
32         future = executer.submit(worker, i)
33         fs.append(future)
34 
35     while True:
36         time.sleep(2)
37         logging.info(threading.enumerate())
38 
39         flag = True
40         for f in fs:  # 判断是否还有未完成的任务
41             logging.info(f.done())
42             flag = flag and f.done()
43             #if not flag: # 注释了这个if，输出的日志看的清楚些
44             #   break
45         print('-' * 30)
46 
47         if flag:
48             executer.shutdown()  # 清理池。除非不用了，否则不用频繁清理池
49             logging.info(threading.enumerate()) # 多进程时看主线程已没有必要了
50             break
    2019-12-04 19:17:23,219     [Process-1:MainThread, 16714:140736847635392] begin to work-0
2019-12-04 19:17:23,219     [Process-2:MainThread, 16715:140736847635392] begin to work-1
2019-12-04 19:17:23,219     [Process-3:MainThread, 16716:140736847635392] begin to work-2
------------------------------
2019-12-04 19:17:25,222     [MainProcess:MainThread, 16713:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145351159808)>, <Thread(QueueFeederThread, started daemon 123145356414976)>]
2019-12-04 19:17:25,223     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:25,223     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:25,223     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:25,223     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:25,223     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:25,223     [MainProcess:MainThread, 16713:140736847635392] False
------------------------------
2019-12-04 19:17:27,227     [MainProcess:MainThread, 16713:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145351159808)>, <Thread(QueueFeederThread, started daemon 123145356414976)>]
2019-12-04 19:17:27,227     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:27,227     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:27,227     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:27,227     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:27,227     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:27,227     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:28,220     [Process-2:MainThread, 16715:140736847635392] finished 1
2019-12-04 19:17:28,220     [Process-1:MainThread, 16714:140736847635392] finished 0
2019-12-04 19:17:28,221     [Process-3:MainThread, 16716:140736847635392] finished 2
2019-12-04 19:17:28,221     [Process-2:MainThread, 16715:140736847635392] begin to work-3
2019-12-04 19:17:28,222     [Process-1:MainThread, 16714:140736847635392] begin to work-4
2019-12-04 19:17:28,222     [Process-3:MainThread, 16716:140736847635392] begin to work-5
2019-12-04 19:17:29,232     [MainProcess:MainThread, 16713:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145351159808)>, <Thread(QueueFeederThread, started daemon 123145356414976)>]
2019-12-04 19:17:29,233     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:29,233     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:29,233     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:29,233     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:29,233     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:29,233     [MainProcess:MainThread, 16713:140736847635392] False
------------------------------
2019-12-04 19:17:31,237     [MainProcess:MainThread, 16713:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145351159808)>, <Thread(QueueFeederThread, started daemon 123145356414976)>]
2019-12-04 19:17:31,238     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:31,238     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:31,238     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:31,238     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:31,238     [MainProcess:MainThread, 16713:140736847635392] False
2019-12-04 19:17:31,238     [MainProcess:MainThread, 16713:140736847635392] False
------------------------------
2019-12-04 19:17:33,223     [Process-2:MainThread, 16715:140736847635392] finished 3
2019-12-04 19:17:33,223     [Process-1:MainThread, 16714:140736847635392] finished 4
2019-12-04 19:17:33,224     [Process-3:MainThread, 16716:140736847635392] finished 5
------------------------------
2019-12-04 19:17:33,240     [MainProcess:MainThread, 16713:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145351159808)>, <Thread(QueueFeederThread, started daemon 123145356414976)>]
2019-12-04 19:17:33,240     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:33,240     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:33,240     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:33,240     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:33,241     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:33,241     [MainProcess:MainThread, 16713:140736847635392] True
2019-12-04 19:17:33,245     [MainProcess:MainThread, 16713:140736847635392] [<_MainThread(MainThread, started 140736847635392)>]
    以上代码执行结果戳这里

    四.支持上下文管理

     1 #！/usr/bin/env python
 2 #_*_conding:utf-8_*_
 3 #@author :yinzhengjie
 4 #blog:http://www.cnblogs.com/yinzhengjie
 5 
 6 """
 7 concurrent.futures.ProcessPoolExecutor继承自concurrent.futures._base.Executor，而父类有 __enter__ 、__exit__方法，支持上下文管理。可以使用with语句。
 8 
 9 __exit__方法本质还是调用的shutdown(wait=True)，就是一直阻塞到所有运行的任务完成
10 
11 使用方法
12     with ThreadPoolExecutor(max_workers=1) as executor:
13         future = executor.submit(pow, 323, 1235)
14         print(future.result())
15 """
16 
17 import threading
18 from concurrent import futures
19 import logging
20 import time
21 
22 # 输出格式定义
23 FORMAT = '%(asctime)-15s	 [%(processName)s:%(threadName)s, %(process)d:%(thread)8d] %(message)s'
24 logging.basicConfig(level=logging.INFO, format=FORMAT)
25 
26 def worker(n):
27     logging.info('begin to work-{}'.format(n))
28     time.sleep(5)
29     logging.info('finished {}'.format(n))
30 
31 
32 if __name__ == '__main__':
33     executer = futures.ProcessPoolExecutor(max_workers=3)       # 创建进程池，池容量为3
34 
35     with executer:  #使用上下文改造进程池的例子，增加返回计算的结果
36         fs = []
37         for i in range(3):
38             future = executer.submit(worker, i)
39             fs.append(future)
40 
41         for i in range(3, 6):
42             future = executer.submit(worker, i)
43             fs.append(future)
44 
45         while True:
46             time.sleep(2)
47             logging.info(threading.enumerate())
48             flag = True
49             for f in fs:  # 判断是否还有未完成的任务
50                 logging.info(f.done())
51             flag = flag and f.done()
52             #if not flag: # 注释了这个if，输出的日志看的清楚些
53             #   break
54 
55             print('-' * 30)
56             if flag:
57                 break
58          #executer.shutdown() # 上下文清理了资源
59     logging.info('===end====')
60     logging.info(threading.enumerate())  # 多进程时看主线程已没有必要了
    2019-12-04 19:25:33,520     [Process-1:MainThread, 16781:140736847635392] begin to work-0
2019-12-04 19:25:33,520     [Process-2:MainThread, 16782:140736847635392] begin to work-1
2019-12-04 19:25:33,521     [Process-3:MainThread, 16783:140736847635392] begin to work-2
2019-12-04 19:25:35,522     [MainProcess:MainThread, 16780:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145557798912)>, <Thread(QueueFeederThread, started daemon 123145563054080)>]
2019-12-04 19:25:35,523     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:35,523     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:35,523     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:35,523     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:35,523     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:35,523     [MainProcess:MainThread, 16780:140736847635392] False
------------------------------
------------------------------
2019-12-04 19:25:37,527     [MainProcess:MainThread, 16780:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145557798912)>, <Thread(QueueFeederThread, started daemon 123145563054080)>]
2019-12-04 19:25:37,527     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:37,527     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:37,527     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:37,527     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:37,527     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:37,527     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:38,521     [Process-1:MainThread, 16781:140736847635392] finished 0
2019-12-04 19:25:38,522     [Process-1:MainThread, 16781:140736847635392] begin to work-3
2019-12-04 19:25:38,522     [Process-2:MainThread, 16782:140736847635392] finished 1
2019-12-04 19:25:38,522     [Process-3:MainThread, 16783:140736847635392] finished 2
2019-12-04 19:25:38,523     [Process-2:MainThread, 16782:140736847635392] begin to work-4
2019-12-04 19:25:38,524     [Process-3:MainThread, 16783:140736847635392] begin to work-5
------------------------------
2019-12-04 19:25:39,532     [MainProcess:MainThread, 16780:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145557798912)>, <Thread(QueueFeederThread, started daemon 123145563054080)>]
2019-12-04 19:25:39,532     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:39,532     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:39,532     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:39,532     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:39,532     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:39,533     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:41,536     [MainProcess:MainThread, 16780:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145557798912)>, <Thread(QueueFeederThread, started daemon 123145563054080)>]
2019-12-04 19:25:41,536     [MainProcess:MainThread, 16780:140736847635392] True
------------------------------
2019-12-04 19:25:41,536     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:41,536     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:41,536     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:41,536     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:41,536     [MainProcess:MainThread, 16780:140736847635392] False
2019-12-04 19:25:43,522     [Process-1:MainThread, 16781:140736847635392] finished 3
2019-12-04 19:25:43,524     [Process-2:MainThread, 16782:140736847635392] finished 4
2019-12-04 19:25:43,524     [Process-3:MainThread, 16783:140736847635392] finished 5
2019-12-04 19:25:43,537     [MainProcess:MainThread, 16780:140736847635392] [<_MainThread(MainThread, started 140736847635392)>, <Thread(Thread-1, started daemon 123145557798912)>, <Thread(QueueFeederThread, started daemon 123145563054080)>]
2019-12-04 19:25:43,538     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:43,538     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:43,538     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:43,538     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:43,538     [MainProcess:MainThread, 16780:140736847635392] True
2019-12-04 19:25:43,538     [MainProcess:MainThread, 16780:140736847635392] True
------------------------------
2019-12-04 19:25:43,541     [MainProcess:MainThread, 16780:140736847635392] ===end====
2019-12-04 19:25:43,542     [MainProcess:MainThread, 16780:140736847635392] [<_MainThread(MainThread, started 140736847635392)>]
    以上代码执行结果戳这里

    五.总结

    　　该库统一了线程池、进程池调用，简化了编程。 

    　　是Python简单的思想哲学的体现。

    　　唯一的缺点:无法设置线程名称。但这都不值一提。
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  • 原文地址：https://www.cnblogs.com/yinzhengjie/p/11901541.html
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