#python threading
import time
'''
  每一秒中，輸出：this is a demo!
'''
def serial():
  '''串行輸出'''
  time.sleep(1)
  print('this is a demo!')
def main():
  for i in range(5):
    serial()
if __name__ == '__main__':
  main()

運(yùn)行結(jié)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，就是很多個(gè)程序在同一時(shí)間(宏觀)一起執(zhí)行

#python threading
import threading
import time
'''
  并行執(zhí)行，輸出：Good!Good!Good!Good!Good!
'''
def parallel():
  '''并行輸出'''
  time.sleep(1)
  print('Good!')
def main():
  for i in range(5):
    t = threading.Thread(target=parallel)
    t.start()
if __name__ == '__main__':
  main()

當(dāng)然我們通過執(zhí)行程序，可以知道，并行程序要比串行程序執(zhí)行的要快....

我們也可以獲取到當(dāng)前的線程及個(gè)數(shù)：

#python threading
import threading
import time
'''
  并行執(zhí)行，輸出：
  [<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)>]
  存在的線程數(shù) ： 7
  Good!Good!Good!Good!Good!
'''
def parallel():
  '''并行輸出'''
  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('存在的線程數(shù) ： %d'%threading.active_count())

運(yùn)行結(jié)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)>]
存在的線程數(shù) ： 7
>>> Good!Good!Good!Good!Good!

希望本文所述對(duì)大家Python程序設(shè)計(jì)有所幫助。

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