renameExt.py

renameExt.py

# usage
# py renameExt.py folder oldExt newExt

import os
import sys

folder = sys.argv[1]
oldExt = f".{sys.argv[2]}"
newExt = f".{sys.argv[3]}"
print(folder, oldExt, newExt)

for (dirpath, dirnames, filenames) in os.walk(folder):
    for filename in filenames:
        pre, ext = os.path.splitext(str(filename))
        if ext == oldExt:
            oriFullPath = os.sep.join([dirpath, filename])
            newFullPath = os.sep.join([dirpath, pre + newExt])
            print(oriFullPath, ' -> ', newFullPath)
            os.rename(oriFullPath, newFullPath)