python问题，thread无法多线程调timer

想多线程周期调用 kafka_producer()，代码如下，点击 pushButton_kafka 按钮，能够调用kafka_producer_start_thread()，并且打印new，但无法调用timer，求解

            global timer
            self.timer = QTimer(self)
            self.timer.timeout.connect(self.kafka_producer)  # 计时器挂接到槽：update
            self.pushButton_kafka.clicked.connect(self.kafka_producer_start)

    def kafka_producer_start(self):
        try:
            global kafka_producer_num
            for kafka_producer_thread_i in range(4):
                _thread.start_new_thread(self.kafka_producer_start_thread,())

        except Exception as e:
            traceback.print_exc()

    def kafka_producer_start_thread(self):
        print("new")
        self.timer.start(50)

    def kafka_producer(self):
            print("here")

package com.steven.demo;

import java.lang.Runnable;
import java.lang.Thread;
public class ThreadTest02 {
public static void main(String[] args) {
//创建线程:
Thread thread = new Thread(new Teacher());
//启动线程
thread.start();
}
}
class Teacher implements Runnable {
//重写Run方法
public void run() {
for (int i = 0; i < 10; i++) {
System.out.println("Run:"+i);
}
}
}