怎么样在python中开发thread线程?
本文实例讲述了python开发之thread线程基矗分享给大家供大家参考,具体如下:
说到线程,我们要知道啥是串行,啥是并行程序
举个例子:
串行程序,就是一个一个的执行程序
#python threading import time ''' 每一秒中,输出:this is a demo! ''' def serial(): '''串行输出''' time.sleep(1) print('this is a demo!') def main(): for i in range(5): serial() if __name__ == '__main__': main()
运行结果如下:
>>> this is a demo! this is a demo! this is a demo! this is a demo! this is a demo! >>>
并行程序,就是很多个程序在同一时间(宏观)一起执行
#python threading import threading import time ''' 并行执行,输出:Good!Good!Good!Good!Good! ''' def parallel(): '''并行输出''' time.sleep(1) print('Good!') def main(): for i in range(5): t = threading.Thread(target=parallel) t.start() if __name__ == '__main__': main()
当然我们通过执行程序,可以知道,并行程序要比串行程序执行的要快....
我们也可以获取到当前的线程及个数:
#python threading import threading import time ''' 并行执行,输出: [<Thread(Thread-2, started 3480)>, <Thread(Thread-1, started 660)>, <Thread(SockThread, started daemon 2920)>, <Thread(Thread-3, started 916)>, <Thread(Thread-4, started 3476)>, <_MainThread(MainThread, started 3964)>, <Thread(Thread-5, started 2060)>] 存在的线程数 : 7 Good!Good!Good!Good!Good! ''' def parallel(): '''并行输出''' time.sleep(1) print('Good!') def main(): for i in range(5): t = threading.Thread(target=parallel) t.start() if __name__ == '__main__': main() print(threading.enumerate()) print('存在的线程数 : %d'%threading.active_count())
运行结果如下:
>>> [<Thread(SockThread, started daemon 15424)>, <Thread(Thread-3, started 15840)>, <Thread(Thread-1, started 10884)>, <Thread(Thread-2, started 14512)>, <Thread(Thread-4, started 13204)>, <_MainThread(MainThread, started 12924)>, <Thread(Thread-5, started 15476)>] 存在的线程数 : 7 >>> Good!Good!Good!Good!Good!
希望本文所述对大家Python程序设计有所帮助。
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