Jan Gosmann wrote: > On 27 Mar 2017, at 18:30, Peter Otten wrote: > >> Are you perchance comparing 32-bit Python 3.5 with 64-bit Python 3.6? > > I don't think so. > [sys.maxsize](https://docs.python.org/3/library/platform.html#cross-platform) > indicates both to be 64-bit.
While my original idea was obviously nonsense given the amount of memory you deal with I still cling to the underlying idea. Perhaps numpy's default integer type has changed (assuming you are using integer arrays, I did look at, but not into your code)? You could compare >>> numpy.array([42]).itemsize 8 for the two interpreters. -- https://mail.python.org/mailman/listinfo/python-list
