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I have composed a simple program to calculate the number of fractions in base form with denominators up to and including 12000, and values in the range (1/3, 1/2). The program always crashes shortly after it reaches he low 6000’s in the denominator. It uses little memory, because it just keeps count rather than saving the numbers. I have tried debugging, and using the fault finder method to no avail. I normally use Python 3x but I altered the code to run in 2x, thinking that might help.link text

What kind of device are you running this on? I just tried your script on an iPad Pro, and it doesn't crash there. The result is 7295372 by the way.

@ld3 The faulthandler code doesn't work properly if you import and run it from your script. You should create/edit the pythonista_startup.py file in your site-packages folder, and import and run the faulthandler there (or copy-paste the entire faulthandler code into the pythonista_startup).

This is necessary because the faulthandler has to run in the Python 2 and 3 interpreters, and it has to run when you restart Pythonista after a crash. Otherwise it produces empty or incomplete crash logs.

Just to be sure - when you say the program crashes, you mean that Pythonista itself crashes to the home screen, right? Or do you mean you get a Python exception/error printed to the console? The faulthandler only does something when Pythonista crashes completely, it's not useful when dealing with Python exceptions.

It also happened to me when the app or the script running try to access a restricted part of the memory or when there is not enough RAM

Since your script does not crash on my ipad pro 2017 (4GBs of RAM) too, i believe it's the second option