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Even the simple examples in the Standard Library docs for the atexit module do not seem to work in Pythonista.

It's not possible to make this work on iOS. The interpreter has to run in the same process as the app, so it never terminates...

@omz atexit seems to work fine in Pythonista 3 -- is it true? Has this issue been solved?

atexit was added in pythonista 2.1/3.0, although it only is called when sys.exit is called, not when pythonista closes, if memory serves

@MTcoder Now the python interpreter runs in a separate process, that's why

I'm on Pythonista 3 and atexit.register on its own doesn't quite work - running sys.exit will call the registered atexit function but forcibly terminating the program (via the stop button) doesn't do that.

Using a try..finally like this, worked, though:

@atexit.register
def _exitcb():
  print('Exit')

try:
  # Do stuff
finally:
  exit()

I'm not sure if that's how it would normally work on a computer running Python but that's just a tiny tidbit of hopefully helpful information for anyone coming across this issue.