On Mon, Nov 14, 2011 at 20:18, MACKEITH Andrew <andrew.macke...@3ds.com> wrote: > Could someone explain this? > > An instance of numpy.int32 is not an instance of int or numpy.int. > An instance of numpy.int64 is an instance of int and numpy.int. > > I don't know if it is a bug in my linux build.
>>>> import sys >>>> sys.maxint > 9223372036854775807 >>>> import platform >>>> print platform.platform() > Linux-2.6.32.12-0.7-default-x86_64-with-SuSE-11-x86_64 This is expected on a 64-bit platform. Note that numpy.int is just an alias for the builtin int type for backwards compatibility with an earlier version of numpy. We could probably remove it, since it seems to be causing more confusion than not. Anyways, we subclass the appropriately sized integer scalar type from Python's int type depending on the platform. So on a platform where Python's int type is 64-bits, numpy.int64 will include int in its inheritance tree. On platforms where the Python int type is 32-bit, numpy.int32 will include it instead. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion