def pick_master_slide(master_slides_path: Path) -> Path:
    """Returns path to a master slide. If argument is a directory,
    returns a randomly chosen file in the directory and if argument
    is a file, returns the argument itself

    :return: path to chosen master slide
    """

    if master_slides_path.is_file():
        return master_slides_path

    master_slides = [
        f.name for f in master_slides_path.iterdir()
        if f.suffix == '.pptx'
        if not f.name.startswith("archived")
    ]

    if master_slides:
        return Path(master_slides_path, random.choice(master_slides))

    raise ValueError(f"Unable to find any valid pptx template file in {master_slides_path}")
Returns path to a master slide. If argument is a directory,
    returns a randomly chosen file in the directory and if argument
    is a file, returns the argument itself

    :return: path to chosen master slide