如何改进这个模型以支持更复杂的红包规则，比如指定最小包额或最大包额？

要改进这个模型来支持更复杂的红包规则，例如指定最小包额和最大包额，你可以对`send_red_packet`方法进行修改。这里提供一种可能的实现：

class AdvancedWeChatRedPacket(WeChatRedPacket):
    def __init__(self, total_amount, min_amount=None, max_amount=None):
        super().__init__(total_amount)
        self.min_amount = min_amount
        self.max_amount = max_amount

    def distribute(self):
        if not self.red_packets:
            self.red_packets = []
            
            if self.min_amount and self.max_amount:
                for participant in self.participants:
                    amount = random.uniform(self.min_amount, self.max_amount)
                    if sum(self.red_packets) + amount > self.total_amount:
                        amount = self.total_amount - sum(self.red_packets)
                    self.red_packets.append(amount)
            else:
                raise ValueError("需要指定最小包额和最大包额")

    def send_red_packet(self):
        if not self.distribute():
            print("红包分配失败，超出预算")
        else:
            for i, (name, amount) in enumerate(zip(self.participants, self.red_packets)):
                print(f"给{name}发了红包：{amount}元")

# 示例
advanced_red_packet = AdvancedWeChatRedPacket(100, min_amount=10, max_amount=30)
advanced_red_packet.add_participant("小明")
advanced_red_packet.add_participant("小红")
advanced_red_packet.send_red_packet()