Ordinal numbers for python

def add_number_suffix(n: int) -> str:
    """Adds suffix to passed in number, ie 1 becomes 1st, 13 becomes 13th....
    :param int number to add suffix
    : returns str
    """
    if 4 <= n <= 20 or 24 <= n % 100 <= 30:  # teens
        suffix = "th"
    else:
        suffix = {1: 'st', 2: 'nd', 3: 'rd'}.get(n % 10, 'th')
    return f'{n}{suffix}'