如何在Python中让n个线程永远同时运行？

import threading

def thread_func(i):
    print("线程 %d 启动" % i)
    # 这里编写线程的具体任务
    print("线程 %d 结束" % i)

# 创建n个线程对象
n = 5
threads = []
for i in range(n):
    t = threading.Thread(target=thread_func, args=(i,))
    threads.append(t)

# 启动所有线程
for thread in threads:
    thread.start()

# 等待所有线程执行完成
for thread in threads:
    thread.join()

print("所有线程执行完毕")