How do I add extensions to files using python in multiple subdirectories

Question

I need to add a .jpg extension to around 300K pictures. They are all in 12 sub-directories and four more subdirectories in each of those 12.

I tried following this post but didn't do a walk down to all subdirectories: Adding extension to multiple files (Python3.5)

I also tried the following:

import os

path = 'C:\\Photos'
genmod = os.walk(path)

for path, pathnames, files in gen_obj:
    for file in files:

        head, tail = os.splitext(file)
        if not tail:
            src = os.path.join(path, pathnames, file)
            dst = os.path.join(path, pathnames, file + '.jpg')

            if not os.path.exists(dst): # check if the file doesn't exist
                os.rename(src, dst)

The above runs but nothing happens.

Answer 1

The above runs but nothing happens.

I doubt that, there are 2 problems:

• os.splitext should be os.path.splitext

• os.path.join should not be given pathnames , so

   os.path.join(path, pathnames, file) 

  should be

   os.path.join(path, file) 

  and

   os.path.join(path, pathnames, file + '.jpg') 

  should be

   os.path.join(path, file + '.jpg')