如何结束另一个线程中的While循环？

from time import sleep
from threading import Thread

condition = False

def check_sth():
    while True:
        if condition:
            print("Condition met, ending")
            break
        else:
            sleep(0.25)
            do_sth()  # Do something everytime the condition is not met

Thread(target=check_sth(), args=(,)).start()
sleep(2)
condition = False
#  Doesn't print "Condition met..."

thread = Thread(target=check_sth(), args=(,))
thread.start()
thread.kill() # (?)

from time import sleep
from threading import Event, Thread

condition = Event()

def do_sth():
    print("truckin' ...")

def check_sth():
    while not condition.is_set():
        sleep(0.25)
        do_sth()  # Do something everytime the condition is not set.

    print("Condition met, ending.")


Thread(target=check_sth, args=()).start()
sleep(2)
condition.set()  # End while loop.

truckin' ...
truckin' ...
truckin' ...
truckin' ...
truckin' ...
truckin' ...
truckin' ...
truckin' ...
Condition met, ending.