智能对话平台 优惠活动

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_active(self, current_date):
        return self.start_date <= current_date <= self.end_date

def apply_promotion(promotions, current_date, original_price):
    for promo in promotions:
        if promo.is_active(current_date):
            return original_price * (1 - promo.discount_rate)
    return original_price

# 示例使用
promotions = [
    Promotion("Summer Sale", 0.2, "2023-06-01", "2023-08-31"),
    Promotion("New Year Offer", 0.15, "2024-01-01", "2024-01-31")
]

current_date = "2023-07-15"
original_price = 100

discounted_price = apply_promotion(promotions, current_date, original_price)
print(f"Discounted Price: ${discounted_price:.2f}")