假設我們要檢查本地網路中哪些ip位址是可達的哪些是不可達的，我們可以用迴圈來實現，也可以用執行緒來實現。
不用執行緒的實現方式：
#!/usr/bin/python
import os, re, threading, commands, time
status = ["no respones","alive, but 50% package loss","alive","shouldn't occur"]
received_packages = re.compile(r"(\d) received")
for suffix in range(20,29):
ip = "10.170.9."+str(suffix)
ping_out = os.popen("ping -c 2 " + ip ,"r")
while true:
line = ping_out.read()
if not line:
break
n_received = re.findall(received_packages, line)
if n_received:
print "status from ", ip, " is ", status[int( n_received[0])],time.ctime(time.time())
執行結果：
status from 10.170.9.20 is alive fri apr 17 13:57:03 2015
status from 10.170.9.21 is no respones fri apr 17 13:57:06 2015
status from 10.170.9.22 is no respones fri apr 17 13:57:09 2015
status from 10.170.9.23 is no respones fri apr 17 13:57:12 2015
status from 10.170.9.24 is no respones fri apr 17 13:57:15 2015
status from 10.170.9.25 is alive fri apr 17 13:57:16 2015
status from 10.170.9.26 is alive fri apr 17 13:57:17 2015
status from 10.170.9.27 is alive fri apr 17 13:57:18 2015
status from 10.170.9.28 is no respones fri apr 17 13:57:22 2015
用執行緒的實現方式：
#!/usr/bin/python
import os, re, threading, commands, time
class ip_check(threading.thread):
def __init__(self, ip):
threading.thread.__init__(self)
self.ip = ip
self.__successful_pings = -1
def run(self):
ping_out = os.popen("ping -c 2 " + self.ip ,"r")
while true:
line = ping_out.read()
if not line:
break
n_received = re.findall(received_packages, line)
if n_received:
self.__successful_pings = int( n_received[0])
def status(self):
if self.__successful_pings == 0:
return "no respones"
elif self.__successful_pings == 1:
return "alive, but 50% package loss"
elif self.__successful_pings == 2:
return "alive"
else:
return "shouldn't occur"
received_packages = re.compile(r"(\d) received")
check_results =
for suffix in range(20,29):
ip = "10.170.9."+str(suffix)
current = ip_check(ip)
current.start()
for el in check_results:
el.join()
print "status from ", el.ip, " is ", el.status(),time.ctime(time.time())
status from 10.170.9.20 is alive fri apr 17 13:57:39 2015
status from 10.170.9.21 is no respones fri apr 17 13:57:41 2015
status from 10.170.9.22 is no respones fri apr 17 13:57:41 2015
status from 10.170.9.23 is no respones fri apr 17 13:57:41 2015
status from 10.170.9.24 is no respones fri apr 17 13:57:41 2015
status from 10.170.9.25 is alive fri apr 17 13:57:41 2015
status from 10.170.9.26 is alive fri apr 17 13:57:41 2015
status from 10.170.9.27 is alive fri apr 17 13:57:41 2015
status from 10.170.9.28 is no respones fri apr 17 13:57:41 2015
無線程和有執行緒的結果分析：
有執行緒的耗時是： 2秒
無線程的耗時是：19秒
執行緒的方式明顯比無線程的快將近10倍。如果在要處理的資料量更大的情況下，執行緒的處理方式的優勢更明顯。
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