(seats)
return available
Find and return seat numbers that are unassigned.

    :param seats: dict - seating chart.
    :return: list - list of seat numbers available for reserving..
Find and return seat numbers that are unassigned.
Find and return seat numbers that are unassigned .
def find_all_available_seats(seats):
    """Find and return seat numbers that are unassigned.

    :param seats: dict - seating chart.
    :return: list - list of seat numbers available for reserving..
    """

    available = []
    for seat_num, value in seats.items():
        if value is None:
            available.append(seat_num)
    return available
def find_all_available_seats ( seats ) : available = [ ] for seat_num , value in seats . items ( ) : if value is None : available . append ( seat_num ) return available