The title really says it all. For example if I had a music file and I wanted to have it play all the way through then how would I make it start another music file after the first is done?

I think that you are posting in the wrong forum: How is this a Python question? Ignoring that issue, you are confused again: A "music file" doesn't "play all the way through" because it holds music, but does not play it. In general terms: To have something happen after something else, you create a supervisor program that tells the system what to do in what order, and you run that program.

I was asking how to do this with python so that is a python question...

I've never used it, but the subprocess module may be what you need. It seems to feature a function that will start a subprocess and wait for the subprocess exit code. If the exit code is non-zero then the function will raise an exception.

No need for subprocesses to run things in sequence:

import os
os.sytem('music_player loud_music.mp3') # silly example
os.system('video_player spinning_things.mp4') # more silliness
# etc

Thank you that is what I was looking for. I was just using music as an example of something that would take time to finish.

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