Hrvoje Abraham added the comment: Reported issue was created in 64-bit Python 3.5.1 (v3.5.1:37a07cee5969, Dec 6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32.
Now I noticed that in Py 2.7 even copysign part does not work as expected. Python 2.7.11 (v2.7.11:6d1b6a68f775, Dec 5 2015, 20:40:30) [MSC v.1500 64 bit (AMD64)] on win32: >>> from math import copysign >>> x = float("-nan") >>> copysign(1.0, x) 1.0 Not correct. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue26785> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com