共享文件存储双十一优惠活动

def apply_discount(user_id, order_amount):
    # 假设从数据库获取用户的优惠信息
    discount_info = get_discount_info(user_id)
    
    if discount_info and is_valid_discount(discount_info):
        discounted_amount = order_amount * (1 - discount_info['percentage'])
        return discounted_amount
    else:
        return order_amount

def get_discount_info(user_id):
    # 模拟从数据库查询用户优惠信息
    discounts_db = {
        'user123': {'percentage': 0.1, 'expiry_date': '2023-11-30'}
    }
    return discounts_db.get(user_id)

def is_valid_discount(discount_info):
    today = datetime.date.today()
    expiry_date = datetime.datetime.strptime(discount_info['expiry_date'], '%Y-%m-%d').date()
    return today <= expiry_date

# 使用示例
user_id = 'user123'
order_amount = 100
final_amount = apply_discount(user_id, order_amount)
print(f"Final amount after discount: {final_amount}")