how to run 2 python file at same time code example

Example: python run code at the same time

def a():
    print("Function a is running at time: " + str(int(time.time())) + " seconds.")

def b():
    print("Function b is running at time: " + str(int(time.time())) + " seconds.")

threading.Thread(target=a).start()
OUTPUT
Function a is running at time: 1585338789 seconds.
threading.Thread(target=b).start()
OUTPUT
Function b is running at time: 1585338789 seconds.