Question

I am a beginner to python and i’m stuck in the assignment given to me.I have a file called file.h which has a certain information and a number in between something like this.

Working copy:C:/tmp
Repository root:svn:/localhost
VERSION_REV 8797
Schedule:normal
Date:13/12/2010

I need to write a python code so that whenever i run it should search for the number 8797 and replace it with a number stored in my variable i.e,x=8798.I tried like below,but not succeeded.

fout = open("path to\file\file.h","r+")
for line in open("path to\file\file.h"):
    line = line.replace("VERSION_REV %i","x")
    fout.write(line)
fout.close()

Sorry,I forgot to mention the i am using windows7 system.

Answer 1

You can use re.sub

import re
.....
line = re.sub(r'(?<=VERSION_REV )\d+', x, line)