Writing Files in Background in Python

Here we are trying to do two tasks at a time, one in the foreground and the other in the background. We’ll write something in the file in the background and of a user input number, will find if it’s an odd or even number.

Doing multiple tasks in one program in python is possible through multithreading in

 Live Demo

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(3)
      print ("Finished Background file write to " + self.out)
def Main():
   message = input("Enter a string to store:" )
   background = AsyncWrite(message,'out.txt')
   #print threading.enumerate()
   background.start()
   print ("The program can continue while it writes in another thread")
   num = int(input("Entered number is : "))
   if (num%2==0):
      print("Entered number is Even")
   else:
      print("Entered number is ODD")
   background.join()
   print ("Waited until thread was complete")
   # print (threading.enumerate())
if __name__ == '__main__':
   Main()

Output

Enter a string to store:Tutorialspoint
The program can continue while it writes in another thread
Entered number is : 33
Entered number is ODD
Finished Background file write to out.txt
Waited until thread was complete