python kill thread

import sys
sys.exit()

# Python program showing 
# how to kill threads 
  
import threading 
import time 
  
def run(): 
    while True: 
        print('thread running') 
        global stop_threads 
        if stop_threads: 
            break
  
stop_threads = False
t1 = threading.Thread(target = run) 
t1.start() 
time.sleep(1) 
stop_threads = True
t1.join() 
print('thread killed')