Question

If the customer has his/her personal bag which is not allowed
in the supermarket, his/her personal bag is kept at the
entrance of the supermarket and the system allocates him/her
an empty compartment number. This is the compartment
where the customer’s personal bag will be kept then he/she
proceeds to do his/her shopping.

Answer 1

def system(has_bag=True):
    global compartment
    if not has_bag:
        return True, None
    for cell in compartment:
        if cell.empty:
            cell.empty = False
            return True, cell.key
    return False, None