云资源流程管理11.11促销活动

class PromotionManager:
    def __init__(self):
        self.promotions = {}

    def add_promotion(self, promotion_id, description, discount_rate):
        self.promotions[promotion_id] = {
            'description': description,
            'discount_rate': discount_rate
        }

    def apply_promotion(self, promotion_id, original_price):
        if promotion_id in self.promotions:
            discount_rate = self.promotions[promotion_id]['discount_rate']
            discounted_price = original_price * (1 - discount_rate)
            return discounted_price
        else:
            return original_price

# 示例使用
manager = PromotionManager()
manager.add_promotion('SAVE20', '20% off all services', 0.20)
final_price = manager.apply_promotion('SAVE20', 100)
print(f"Final price after promotion: ${final_price}")