python开发_thread_线程基础

 1 #python threading
 2 
 3 import time
 4 '''
 5     每一秒中，输出：this is a demo!
 6 '''
 7 
 8 def serial():
 9     '''串行输出'''
10     time.sleep(1)
11     print('this is a demo!')
12 
13 def main():
14     for i in range(5):
15         serial()
16 
17 if __name__ == '__main__':
18     main()

 1 #python threading
 2 
 3 import threading
 4 import time
 5 '''
 6     并行执行，输出：Good!Good!Good!Good!Good!
 7 '''
 8 
 9 def parallel():
10     '''并行输出'''
11     time.sleep(1)
12     print('Good!')
13 
14 def main():
15     for i in range(5):
16         t = threading.Thread(target=parallel)
17         t.start()
18 
19 if __name__ == '__main__':
20     main()

 1 #python threading
 2 
 3 import threading
 4 import time
 5 '''
 6     并行执行，输出：
 7     [<Thread(Thread-2, started 3480)>, <Thread(Thread-1, started 660)>,
 8     <Thread(SockThread, started daemon 2920)>, <Thread(Thread-3, started 916)>,
 9     <Thread(Thread-4, started 3476)>, <_MainThread(MainThread, started 3964)>,
10     <Thread(Thread-5, started 2060)>]
11     存在的线程数 ： 7
12     Good!Good!Good!Good!Good!
13 '''
14 
15 def parallel():
16     '''并行输出'''
17     time.sleep(1)
18     print('Good!')
19 
20 def main():
21     for i in range(5):
22         t = threading.Thread(target=parallel)
23         t.start()
24 
25 if __name__ == '__main__':
26     main()
27     print(threading.enumerate())
28     print('存在的线程数 ： %d'%threading.active_count())