python-fileinput备份与替换（整行替换）

root@kali:~/python# ls
contact_list.txt  fileinputreadfile.py  scan1.py         test.py
csvt01            manage_query.py       scanhostport.py  test.txt
csvtpy            newtext.txt           tab.py           userinput.py

fileinputbak.py   oldtext.txt  

root@kali:~/python# cat contact_list.txt 
tom it m 18912378667 shanghai
jack op m 15876544332 beijin
lilei it m 15325635588 taiwan
flake it w 18900378667 nanchang
alex op m 15833544332 shijiazang
lili lp m 15123635588 hangzhou
mayun xi m 18912345667 ningbo
zhang py w 15876541222 yunnan
lisi op m 15333333333 haikou
wangwu java m 18999999999 shandong
song js w 15000000000 shenzhen
caiqi js w 15555555555 huizhou

root@kali:~/python# vim fileinputbak.py
root@kali:~/python# cat fileinputbak.py 
#!/usr/bin/python


import fileinput


for line in fileinput.input('contact_list.txt',backup='.bak',inplace=1): //把contact_list.txt'原文件进行一份备份后，并对源文件进行修改，inplace=1表示进行修改

line = line.replace('tom','thomas') //对源文件中tom值替换成thomas值

print line

root@kali:~/python# ls
contact_list.txt  fileinputreadfile.py  scan1.py         test.py
csvt01            manage_query.py       scanhostport.py  test.txt
csvtpy            newtext.txt           tab.py           userinput.py
fileinputbak.py   oldtext.txt           tab.pyc          xwbtest.txt
root@kali:~/python# python fileinputbak.py 
root@kali:~/python# ls
contact_list.txt      fileinputbak.py       oldtext.txt      tab.pyc       xwbtest.txt
contact_list.txt.bak  fileinputreadfile.py  scan1.py         test.py
csvt01                manage_query.py       scanhostport.py  test.txt
csvtpy                newtext.txt  

root@kali:~/python# cat fileinputbak.py 
#!/usr/bin/python


import fileinput


for line in fileinput.input('contact_list.txt',backup='.bak',inplace=1):
line = line.replace('tom','thomas')
print line
root@kali:~/python# cat contact_list.txt.bak   //源文件完整性进行了备份
tom it m 18912378667 shanghai
jack op m 15876544332 beijin
lilei it m 15325635588 taiwan
flake it w 18900378667 nanchang
alex op m 15833544332 shijiazang
lili lp m 15123635588 hangzhou
mayun xi m 18912345667 ningbo
zhang py w 15876541222 yunnan
lisi op m 15333333333 haikou
wangwu java m 18999999999 shandong
song js w 15000000000 shenzhen
caiqi js w 15555555555 huizhou
root@kali:~/python# cat contact_list.txt
thomas it m 18912378667 shanghai    //对源文件的tom替换成了thomas


jack op m 15876544332 beijin


lilei it m 15325635588 taiwan


flake it w 18900378667 nanchang


alex op m 15833544332 shijiazang


lili lp m 15123635588 hangzhou


mayun xi m 18912345667 ningbo


zhang py w 15876541222 yunnan


lisi op m 15333333333 haikou


wangwu java m 18999999999 shandong


song js w 15000000000 shenzhen


caiqi js w 15555555555 huizhou


root@kali:~/python#