python - Python PyShark 生成器退出

Question

我有一个从 PyShark 读取 ICMP 数据包的代码块。喜欢 ：

capture = pyshark.LiveCapture(interface=self.networkInterface)
        packet_generator = capture.sniff_continuously()
        while True:
            if self.exitProgram:
                try:
                    raise pyshark.capture.capture.StopCapture()
                except Exception as e:
                    print("Stopping ICMP Listener")
                break

            try:
                print("Look if there is Packet")
                packet = next(packet_generator)
                handlePacket(packet)
            except:
                print("No Packet")
            sleep(0.25)

capture.sniff_continuously返回生成器的方法。创建 ICMP 数据包时，它会捕获它并发送到handlePacket，但是当它没有时，我期望输出如下，

Look if there is Packet
No Packet

但是，它只是打印Look if there is Packet并等待，这是我不想要的。如何让它在给定的循环中运行并检查数据包是否到达？