linux下快速列出局域网中所有主机名（计算机名）的脚本

  #!/usr/bin/env python3    import os    def shellrun(cmd):      a = os.popen(cmd)      b = a.read()      c = b.split('n')      return c    def cutarpresult(lst):      a = []      b = []      for line in lst[2:]:          if line != '':              a.append(line)          else:              break      for line in a:          b.append(line.split('t')[0])      return b    def commandmaker(ip):      return 'nmblookup -A ' + ip    def getrst(iplist):      rst = []      for ip in iplist:          rst.append(shellrun(commandmaker(ip)))      return rst    def washrst(rst):      rtn = []      for line in rst:          if line[1].split(' ')[1] != 'reply':              rtn.append(line[:-1])      return rtn    def main():      interface = input('which interface to use: ')      iplist = cutarpresult(shellrun('arp-scan -I ' + interface + ' -l'))      for rs in washrst(getrst(iplist)):          for line in rs:              print(line)    if __name__ == '__main__':      main()