Getting unresolved reference error in line 5

I want to print change, after 2 sec but I am getting unresolved reference error in line 5. What should I do?

import threading
def inchange():
    global change = 0
    threading.Timer(1, inchange).start()
    change = change + 2
    print(change)

if __name__ == "__main__":
    inchange()

>Solution :

The problem is how you access global change.

Here is the code:

import threading

change = 0

def inchange():
    global change
    threading.Timer(1, inchange).start()
    change = change + 2
    print(change)

if __name__ == "__main__":
    inchange()

Output:

2