def get_filepaths(parent_dir, ext='csv'):
    """
    Accepts a parent directory filepath - pathlib.Path object
    and a string representing a file extension
    Recursivley finds all files with that extension below the parent filepath
    Returns a list of all filepaths as pathlib.Path objects
    """
    filepaths = list(parent_dir.rglob('*.' + ext))
    return filepaths