asyncWrite.py

import threading
import time

class AsyncWrite(threading.Thread):
    def __init__(self, text, out):
        threading.Thread.__init__(self)
        self.text=text
        self.out=out

    def run(self):
        f=open(self.out,"a")
        f.write(self.text+'\n')
        f.close()
        time.sleep(2)
        print ("Finished Background file write to "+ self.out)


def Main():
    message=input("Enter a string to store:")
    background=AsyncWrite(message, 'out.txt')
    background.start()
    print ("The program can continue to run while it write in another thread")
    print (100+400)

    background.join()
    print("Waited until thread was complete")

if __name__=='__main__':
    Main()