python: Create thread by function or class

thread_example.py

from threading import Thread
import time

class Timer(Thread):
    def __init__(self, func, time):
        super().__init__()
        self.func = func
        self.time = time

    def run(self):
        time.sleep(self.time)
        self.func()

def testFunc():
    print("Time up!")

def runInThread(func):
    thread = Thread(target=testFunc)
    thread.start()

def setTimeout(func, time):
    timer = Timer(func, time)
    timer.start()

if __name__ == '__main__':
    runInThread(testFunc)
    setTimeout(testFunc, 1.5)