You can use os.walk to recursively walk through the directory and subsequently use os.rename to rename the files.
import os def replace(folder_path, old, new): for path, subdirs, files in os.walk(folder_path): for name in files: if(old.lower() in name.lower()): file_path = os.path.join(path,name) new_name = os.path.join(path,name.lower().replace(old,new)) os.rename(file_path, new_name)
You can use this function as follows −
replace('my_folder', 'IMG', 'Image')
This will find all files recursively within the folder and its sub-folders and replace IMG with Image in each one of them. You can modify the function as it suits you for a better result suited to your need.