智能硬件语音助手优惠卷

class Coupon:
    def __init__(self, code, discount_amount, min_purchase, expiration_date):
        self.code = code
        self.discount_amount = discount_amount
        self.min_purchase = min_purchase
        self.expiration_date = expiration_date

    def is_valid(self, purchase_amount, current_date):
        return (current_date <= self.expiration_date and
                purchase_amount >= self.min_purchase)

def apply_coupon(coupon, purchase_amount, current_date):
    if coupon.is_valid(purchase_amount, current_date):
        return purchase_amount - coupon.discount_amount
    else:
        return purchase_amount

# 使用示例
coupon = Coupon(code="VOICE2023", discount_amount=50, min_purchase=500, expiration_date="2023-12-31")
final_price = apply_coupon(coupon, purchase_amount=600, current_date="2023-11-01")
print(f"Final price after applying coupon: {final_price}")