(Puma333), there is a book in English
"Pro Android Python with SL4A". However, I was too lazy to read it, and I just looked at how the file test.py in SL4A and began to make their own mini-applets :)
However, SL4A - already outdated technology. Suffice it to say that it does not work (or not work) on devices with Android 5.0 and above. Therefore, if you want to write a Python for Android, I advise you to look at the framework's
Kivy, It is more modern and has more features (you can even assemble applications in the APK and upload to Google Play).
Explay84, strange, never seen this on their devices. Is the program still gives some information about the error?