root@python-10:/home/liujianzuo/python/test# ls

 passwd  rc.local  test1

 root@python-10:/home/liujianzuo/python/test# py test1 -r EXIT exit /home/liujianzuo/python/test/rc.local

       共修改了0行。

 root@python-10:/home/liujianzuo/python/test# py test1 -r exit EXIT /home/liujianzuo/python/test/rc.local 

 the new line is :

   第 6 行 : # Make sure that the script will "EXIT 0" on success or any other

 the word was replaced is : exit==>EXIT

 the new line is :

   第 16 行 : EXIT 0

 the word was replaced is : exit==>EXIT

       共修改了2行。

 root@python-10:/home/liujianzuo/python/test# cat test1

 #coding:utf-8

 #!/usr/bin/env python

 import sys,os,subprocess

 #a="liujianzuo"

 if len(sys.argv) < 5:

     exit("argc less than 4;like python test.py -r 准备替换的字符 要替换的字符 file_path_name")

 if '-r' in sys.argv:

     ar1=sys.argv.index('-r')

     ar2=sys.argv[ar1+ 1]

     ar3=sys.argv[ar1 + 2]

     filname= sys.argv[ar1 + 3]

 else:

     exit("the first argv must be -r ")

 basedir = "%s/%s"%(os.path.dirname(filname),os.path.basename(filname))

 f=file('%s'%basedir,"r+")

 sum1=0

 numli=0

 while True:

     line=f.readline()

     numli+=1

     #print line

     if ar2 in line:

        # print "now pos+++>",f.tell()

         f.seek(f.tell()-len(line))

         #print f.tell()

         new_line=line.replace(ar2,ar3)

         f.write(new_line)

         print """

 \033[31;1mthe new line is :\033[0m

   第 %s 行 : %s

 the word was replaced is : \033[32;1m%s==>%s\033[0m

         """ % (numli,new_line.strip(),ar2,ar3)

         sum1+=1

         continue

         if line == "":

             print "file is done  bye"

             break

     elif line == "":

         break

 print "\033[33;1m      共修改了%s行。\033[0m"%sum1

 f.close()