How to USE python to find out /etc/hosts ip

import os,re tt2=open('/etc/hosts','r')
for s in tt2: #ip hostname pattern as \d+.\d+.\d+.\d \d means number
     matchObj = re.match( r'\d+.\d+.\d+.\d+\t\w+',s)
        if matchObj:
           print "matchObj.group() : "matchObj.group().split('\t')

PARAMETER PARSE

import platform,sys,os,fileinput,re global dstconfig,org_pattern,chg_pattern,srcconfig,org_pattern srcconfig='' org_pattern='' dstconfig='' org_pattern='' patternfs="/Users/Hermes/Downloads/srt.txt" def get_ip(): bond1_dst='/etc/sysconfig/network-scripts/ifcfg-bond1' eth1_dst='/etc/sysconfig/network-scripts/ifcfg-eth1' if os.path.isfile(bond0_dst) == True: temp=open(bond1_dst,'r') text=temp.read() ip_tmp=str(re.findall('IPADDR=\d+.\d+.\d+.\d+',text)) ip=ip_tmp.rsplit('IPADDR=') elif os.path.isfile(bond1_dst) == False and os.path.isfile()==True: temp=open(eth01_dst,'r') text=temp.read() ip_tmp=str(re.findall('IPADDR=\d+.\d+.\d+.\d+',text)) ip=ip_tmp.rsplit('IPADDR=') else: print('some wrong') def change_file(srcconfig,org_pattern,chg_pattern): changing_file_dst='/Users/Hermes/Downloads/srt.txt' changefile=fileinput.input(srcconfig, inplace=1) #results=re.sub(stringa,replace,changefile) result=st.replace(pattern,replace_str) changefile.close() def paramter_parse(patternfs): ofs=open(patternfs) for s in ofs: parameter=tuple(s.split('::')) print(parameter) print(range(len(parameter))) if len(parameter)

How to use python replace a word as sed does

import os,fileinput 
changing_file_dst='/Users/Hermes/Downloads/srt.txt' changefile=fileinput.input(changing_file_dst, inplace=1)
 # <==this is part very import if you just fileinput.input(change_file_dst) data will not modified , so you need set inplace=1 to modify current file 
for st in changefile:
 replace_str='cluster.enabled=true'
 pattern='cluster.enabled=false'
 result=st.replace(pattern,replace_str)
 print(result) changefile.close()

 original I just want use open , but when I write all file will be truncate and write . so I use fileinput.
原本是用open 將檔案 打開修改可是用 W mode 會因為先作truncated , 再寫入所以檔案會被清空 ，所以改用 fileinput 直接作修改