Tim Peters <tim.pet...@gmail.com> added the comment: Do you realize that 2**54-1 isn't exactly representable as a float? It requires 54 bits of precision, but the Python float format only has 53 bits available (on all popular boxes).
>>> 2**54-1 18014398509481983L >>> float(_) # rounds to closest representable float 18014398509481984.0 In fact, x//y == x//float(y) for only a small subset of integer x and y values, mostly because only a small subset of integer x and y values are exactly representable as floats (given that Python integers enjoy unbounded precision, but floats only retain 53 bits). ---------- nosy: +tim_one _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue6387> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
