[issue22548] Bogus parsing of negative zeros in complex literals
Mark Dickinson
report at bugs.python.org
Fri Oct 3 19:28:16 CEST 2014
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.
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resolution: -> not a bug
status: open -> closed
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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22548>
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