How do I detect if a Window gets closed?

Question

Ok I opened a .mp4 using

import os
os.startfile('test.mp4')

How can I detect when the window (of the default Windows app used to show videos) gets closed to run the rest of the code?

Answer 1

You can't do it with startfile.

From Python documentation:

There is no option to wait for the application to close, and no way to retrieve the application’s exit status

You would need to use the subprocess module instead:

import subprocess

subprocess.run(['start', 'test.mp4'])

# do other stuff

This command will not exit until the program you ran is closed.