物联网络新年特惠

class Promotion:
    def __init__(self, name, discount, start_date, end_date):
        self.name = name
        self.discount = discount
        self.start_date = start_date
        self.end_date = end_date

def notify_customers(promotions):
    today = datetime.date.today()
    for promo in promotions:
        if promo.start_date <= today <= promo.end_date:
            print(f"Special Offer: {promo.name} - {promo.discount}% off until {promo.end_date}!")

# 示例促销活动
new_year_promo = Promotion("New Year Sale", 20, datetime.date(2024, 1, 1), datetime.date(2024, 1, 31))

# 通知客户
notify_customers([new_year_promo])