python shell 根据 ip 获取 hostname 或根据 hostname 获取 ip

前言

方法1：利用 socket 模块 里的 gethostbyname 函数

>>> import socket
>>> socket.gethostbyname("www.baidu.com")
'61.135.169.125'
>>> socket.gethostbyname("rs.xidian.edu.cn")
'202.117.119.1'

方法2 利用 shell 中 hostname 命令

def getHostName(ip):
    command = 'java -jar %s %s "hostname > %s.hostname"' %(remoteCmdLoca,ip,ip)
    result = subprocess.call(command,shell=True)
    command = '%s -q -r -pw passwd %s [email?protected]%s:/root' % (pscpLoca,pscpLoca,shell=True)
    command = '%s -q -r -pw passwd [email?protected]%s:/root/%s.hostname %s' %(pscpLoca,fileDir)
    result = subprocess.call(command,shell=True)
    fileName = fileDir + ip + '.hostname'
    readFile = open(fileName,'r')
    hostnameInfo =  str(readFile.readline().strip('n'))
    readFile.close()
    subprocess.call('rm '+ fileName,shell=True)
    print "=========%s hostname is %s========" %(ip,hostnameInfo)
    return hostnameInfo