时间:2021-07-01 10:21:17 帮助过:26人阅读
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
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()
- #python threading
- import time
- '''
- 每一秒中,
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
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()
- #python threading
- import threading
- import time
- '''
- 并行执行,
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:
输出: [
- #python threading
- import threading
- import time
- '''
- 并行执行,
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!
- </thread(thread-5,></thread(thread-4,></thread(thread-2,></thread(thread-1,></thread(thread-3,></thread(sockthread,>
希望本文所述对大家Python程序设计有所帮助。