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怎么样在python中开发thread线程?

2016-07-06 18:12:36 来源:www.45fan.com 【

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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Tags: python 发之 thread
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