278 def walk(top, topdown=True, onerror=None, followlinks=False):  argument
379             if not topdown and is_dir:
398     if topdown:
410                 yield from walk(new_path, topdown, onerror, followlinks)
414             yield from walk(new_path, topdown, onerror, followlinks)
422     def fwalk(top=".", topdown=True, onerror=None, *, follow_symlinks=False, dir_fd=None):  argument
466                                   topdown, onerror, follow_symlinks)
470     def _fwalk(topfd, toppath, isbytes, topdown, onerror, follow_symlinks):  argument
478         entries = None if topdown or follow_symlinks else []
498         if topdown:
504                     if topdown:
519                                       topdown, onerror, follow_symlinks)
523         if not topdown: