Mark Dickinson added the comment: This is not a bug, but a known and difficult-to-avoid issue with signed zeros and creating complex numbers from real and imaginary parts. The safe way to do it is to use the `complex(real_part, imag_part)` construction.
In the first example, you're subtracting a complex number (0.j) from a float (-0.0). The float gets promoted to a complex (by filling in an imaginary part of +0.0), and the imaginary literal is similarly treated as a complex number (by filling in a 0.0 for the real part). So the subtraction is doing: complex(-0.0, 0.0) - complex(0.0, -0.0) which as expected gives a real part of -0.0, and an imaginary part of +0.0. ---------- resolution: -> not a bug status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22548> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
