Python – Search for specific types of files and rename the files or part of the files

file_extension_renamer.py

import os
import re
  
src_drct='/home/gmastrokostas/tmp'
  
for files in os.listdir(src_drct):
  
    if files.endswith('.txt'): #Select all files with the .txt ext
        oldF = os.path.join(src_drct, files) #Join full path with files found
        midF = re.split(r'\_', files) #split files that contain underscore
        newF = oldF.replace('_01012015', '_01012014') #create the replacement var
        out = os.rename(oldF, newF) #start renaming.