find and replace string from multiple files in a folder using python

Question

I want to find string e.g. "Version1" from my files of a folder which contains multiple ".c" and ".h" files in it and replace it with "Version2.2.1" using python file.

Anyone know how this can be done?

Answer 1

Here's a solution using os, glob and ntpath. The results are saved in a directory called "output". You need to put this in the directory where you have the .c and .h files and run it.

Create a separate directory called output and put the edited files there:

import glob
import ntpath
import os

output_dir = "output"

if not os.path.exists(output_dir):
    os.makedirs(output_dir)

for f in glob.glob("*.[ch]"):
    with open(f, 'r') as inputfile:
        with open('%s/%s' % (output_dir, ntpath.basename(f)), 'w') as outputfile:
            for line in inputfile:
                outputfile.write(line.replace('Version1', 'Version2.2.1'))

Replace strings in place:

IMPORTANT! Please make sure to back up your files before running this:

import glob

for f in glob.glob("*.[ch]"):
    with open(f, "r") as inputfile:
        newText = inputfile.read().replace('Version1', 'Version2.2.1')

    with open(f, "w") as outputfile:
        outputfile.write(newText)