python中使用subprocess來使用shell

關于threading的用法

from __future__ import print_functionimport subprocessimport threadingdef is_reachable(ip):  if subprocess.call(["ping", "-c", "2", ip])==0:#只發送兩個ECHO_REQUEST包    print("{0} is alive.".format(ip))  else:    print("{0} is unalive".format(ip))if __name__ == "__main__":  ips = ["www.baidu.com","192.168.0.1"]  threads = []  for ip in ips:    thr = threading.Thread(target=is_reachable, args=(ip,))#參數必須為tuple形式    thr.start()#啟動    threads.append(thr)  for thr in threads:    thr.join()

改良 ：使用Queue來優化（FIFO）

from __future__ import print_functionimport subprocessimport threadingfrom Queue import Queuefrom Queue import Emptydef call_ping(ip):  if subprocess.call(["ping", "-c", "2", ip])==0:    print("{0} is reachable".format(ip))  else:    print("{0} is unreachable".format(ip))def is_reachable(q):  try:    while True:      ip = q.get_nowait()#當隊列為空，不等待      call_ping(ip)  except Empty:    passdef main():  q = Queue()  args = ["www.baidu.com", "www.sohu.com", "192.168.0.1"]  for arg in args:    q.put(arg)  threads = []  for i in range(10):    thr = threading.Thread(target=is_reachable, args=(q,))    thr.start()    threads.append(thr)  for thr in threads:    thr.join()if __name__ == "__main__":  main()

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