虚拟主播新购优惠

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

    def is_valid(self, purchase_date):
        return self.start_date <= purchase_date <= self.end_date

def apply_promotion(promotion, original_price):
    if promotion.is_valid(purchase_date):
        discounted_price = original_price * (1 - promotion.discount_rate)
        return discounted_price
    else:
        return original_price

# 示例使用
promotion = Promotion("新购优惠", 0.1, "2023-10-01", "2023-10-31")
purchase_date = "2023-10-15"
original_price = 100

final_price = apply_promotion(promotion, original_price)
print(f"最终价格: {final_price}")