python 关于线程的参数args的问题

import time, threading# 假定这是你的银行存款:balance = 0def change_it(n): # 先存后取，结果应该为0: global balance balance = balance + n balance = balance - nlock = threading.Lock()def run_thread(n): for i in range(100000): # 先要获取锁: lock.acquire() try: # 放心地改吧: change_it(n) finally: # 改完了一定要释放锁: lock.release()t1 = threading.Thread(target=run_thread, args=(5,))t2 = threading.Thread(target=run_thread, args=(8,))t1.start()t2.start()t1.join()t2.join()print(balance)

谁能解释下代码里的args=(5,)是什么意思 搞不懂