python 线程如何多次调用？

t1 怎么可以多次调用呢？

import time
import threading

def end():
    time.sleep(2)
    print('完成')

t1 = threading.Thread(target=end)

def start():
    print('开始')
    for i in range(5):
        for r in range(5):
            time.sleep(1)
            print(r)
        t1.start()

start()

运行结果及详细报错内容

开始
0
1
2
3
4
0
完成
1
2
3
4
Traceback (most recent call last):
  File "D:\Code\NewWorld\Test1.py", line 18, in 
    start()
  File "D:\Code\NewWorld\Test1.py", line 16, in start
    t1.start()
  File "C:\Users\XXX\AppData\Local\Programs\Python\Python310\lib\threading.py", line 923, in start
    raise RuntimeError("threads can only be started once")
RuntimeError: threads can only be started once

望采纳，可以这样改

import time
import threading
 
def end():
    time.sleep(2)
    print('完成')
 
def start():
    print('开始')
    for i in range(5):
        t1 = threading.Thread(target=end)
        for r in range(5):
            time.sleep(1)
            print(r)
        t1.start()
 
start()