def convert_iterable_to_string_of_types(iterable_var):
    """Convert an iterable of values to a string of their types.

    Parameters
    ----------
    iterable_var : iterable
        An iterable of variables, e.g. a list of integers.

    Returns
    -------
    str
        String representation of the types in `iterable_var`. One per item
        in `iterable_var`. Separated by commas.

    """
    types = [str(type(var_i)) for var_i in iterable_var]
    return ", ".join(types)