def make_qs(listname: list) -> str:
    """Create a list of '?'s for use in a query string.

       This is a convenience function that will take a list and return a string
       composed of len(list) queston marks joined by commas for use in an sql
       VALUES() clause.
       
       Args:
           listname: The list to use for generation.
    """
    return ",".join(["?" for _ in range(len(listname))])