python实现扫描局域网指定网段ip的方法

pingS.py
import sys
import os
import time
import _thread
import datetime
def get_os():
  os = platform.system()
  if os == "Windows":
    return "n"
  else:
    return "c"
def ping_ip(ip_str):
  cmd = ["ping", "-{op}".format(op=get_os()),
      "1", ip_str]
  output = os.popen(" ".join(cmd)).readlines()
  flag = False
  for line in list(output):
    if not line:
      continue
    if str(line).upper().find("TTL") >=0:
      flag = True
      break
  if flag:
    print("*** *** *** ip: %s is OK *** *** ***"%(ip_str))
def find_ip(ip_prefix):
  for i in range(1,256):
    ip = ('%s.%s'%(ip_prefix,i))
    _thread.start_new_thread(ping_ip, (ip,))
    time.sleep(0.3)
if __name__ == "__main__":
  startTime = datetime.datetime.now()
  print("start time %s"%(time.ctime()))
  net=sys.argv[1]
  args = "".join(("192.168."+net+".1"))
  ip_prefix = '.'.join(args.split('.')[:-1])
  find_ip(ip_prefix)
  endTime = datetime.datetime.now()
  print("end time %s"%(time.ctime()))
  print("total takes :",(endTime - startTime).seconds)