Find leaf folders that aren't hidden folders

I have a folder structure with some epubs and json files in the down-most folders (not counting the .ts folders). I'm exporting tags from the json files to tagspaces, by creating a .ts folder with some other json files. I've already processed part of the files and now I want to find the leaf folders that don't have a .ts folder in their path, to find the remaining files without having to process the others twice.

So for this example I only want to do something for the folder t5:

test├── t1│  ├── t2│  │  └── t5│  └── t3│  └── .ts└── .ts└── t4

This is what I've tried:

def process_files_in_leaf_subdirectories(dir: str) -> None:    dirs = []    for root, subdirs, filenames in os.walk(dir):        if subdirs or '.ts' in root:            continue        dirs.append(root)    return dirsdef test_process_files_in_leaf_subdirectories():    os.makedirs('tmp/t1/t2/t5', exist_ok=True)    os.makedirs('tmp/t1/t3/.ts', exist_ok=True)    os.makedirs('tmp/.ts/t4', exist_ok=True)    assert get_files_in_leaf_subdirectories('tmp') == ['tmp/t1/t2/t5']    shutil.rmtree('tmp')

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