網路編程-線程-2、如何查看有多少個線程在運行

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以上一節代碼為例,如何查看啟動並執行線程數,需要調用threading模組裡面的enumerate方法,返回一個線程數列表:

import threadingimport time"""以上一章的代碼為例,如何查看有多少個線程在運行"""def sing():    """唱歌5秒鐘"""    for i in range(3):        print(‘----------------‘)        print(‘我在唱歌....‘)        time.sleep(1)def dance():    for i in range(5):        print(‘我在跳舞....‘)        print(‘----------------‘)        time.sleep(1)def main():    t = threading.Thread(target=sing)      t2 = threading.Thread(target=dance)    t.start()    t2.start()    # 迴圈列印正在啟動並執行線程數,調用threading模組中的enumerate方法返回一個列表,裡面的元素就是啟動並執行線程,列印出元素個數就是線程數    while True:        nums = len(threading.enumerate())        print(threading.enumerate())        # 當沒有線程時,就退出        if nums <= 1:            break        time.sleep(1)if __name__ == ‘__main__‘:    main()

運行結果如下:

我在唱歌....
我在跳舞....
[<_MainThread(MainThread, started 26264)>, <Thread(Thread-1, started 23804)>, <Thread(Thread-2, started 24216)>]
[<_MainThread(MainThread, started 26264)>, <Thread(Thread-1, started 23804)>, <Thread(Thread-2, started 24216)>]
我在跳舞....
我在唱歌....
[<_MainThread(MainThread, started 26264)>, <Thread(Thread-1, started 23804)>, <Thread(Thread-2, started 24216)>]
我在唱歌....
我在跳舞....
[<_MainThread(MainThread, started 26264)>, <Thread(Thread-1, started 23804)>, <Thread(Thread-2, started 24216)>]
我在跳舞....
[<_MainThread(MainThread, started 26264)>, <Thread(Thread-2, started 24216)>]
我在跳舞....
[<_MainThread(MainThread, started 26264)>, <Thread(Thread-2, started 24216)>]
[<_MainThread(MainThread, started 26264)>]

 

解釋如:

 

網路編程-線程-2、如何查看有多少個線程在運行

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