On: 1B nested loop iterations

[UltraSane]

I would expect that would break the Python interpreter. Hmm. Now you have me wanting to try it. Writing Python that writes Python is always fun.

[andreareina → UltraSane]

The indentation alone would be half an exabyte. You could transform it into an equivalent representation with a billion-variable list (or numpy array) that should fit within the limits of the interpreter.