On Mon, Dec 31, 2018 at 6:36 PM Ian Kelly <ian.g.ke...@gmail.com> wrote: > > The Google group has an initial post in this thread that didn't make it > through to the mailing list for whatever reason. For posterity, here > it is:
Thanks Ian. > > Why are the following two similar prints slightly different and how fix? > > > > >>> x = 0x739ad43ed636 > > > > >>> print(x + (-x) // 2048) > > 127046758190683 > > > > >>> print(x - x // 2048) > > 127046758190684 > > > > I'm working in an area where such deviations matter. It would nice to > > understand what is happening. This is a distinctly different order of operations. Remember from grade school that division is done before addition and subtraction; the first one will calculate (-x)//2048 and then add that onto x, and the second will calculate x//2048 and then subtract that from x. As has already been pointed out, Python's // operator is *floor division*, meaning that it will always round down, whether the number is positive or negative. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
