The apk is a simple zip file, so you can just extract it.
Inside it, there will be a "private.mp3" file. That's a .tar.gz, so
you can also extract that file to find your compiled python files.
Now you have to try your luck with one of the many tools available for
decompiling this files. Search github and stackoverflow that you will
find a lot of information.
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Ronaldo Maia
Async Open Source