Python: recurse directory

import os, sys
from stat import *
from typing import Callable


def visit_file(file):
    print('visiting', file)


def walktree(top, callback: Callable):
    print(f'{top=}')
    for f in os.listdir(top):
        path = os.path.join(top, f)
        st_mode = os.stat(path, follow_symlinks=False).st_mode

        if S_ISDIR(st_mode):
            walktree(path, callback)
        elif S_ISREG(st_mode):
            callback(path)
        else:
            print('skipping %s' % path)


walktree('log_', visit_file)