Question

I am trying to use threading.Timer, I am wondering is this timer is started in another thread? So I need to protect the variables accessed by this timer?

Answer 1

You could see in the threading.py file that threading.Timer() returns an instance of a new Thread. Or you could run an example:

import threading

def ontimer():
    print threading.current_thread()

def main():
    threading.Timer(2, ontimer).start()
    print threading.current_thread()

if __name__=="__main__":
    main()

You need to protect the variables accessed by Timer‘s callback.