def stringify(inp):
    """
    "Stringify" the input, hopefully sensibly.

    Parameters
    ----------
    inp
        Thing to be stringified.

    Returns
    -------
    str

    """
    if inp is None:
        return None
    if isinstance(inp, str):
        return inp
    if isinstance(inp, list):
        return ','.join(inp)
    return str(inp)