Tim Peters added the comment:
I'm OK with -1, but I don't get that or -0.0 on 32-bit Windows Py 3.4.1:
Python 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:38:22) [MSC v.1600 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> -0.5 // float('inf')
nan
So maybe NaN is the best answer ;-)
In favor of -1.0: that _is_ the limit of the mathematical floor(-0.5 / x) as x
approaches +infinity.
In favor of -0.0: it "should be" mathematically that floor_division(x/y) =
floor(x / y), and floor(-0.5 / inf) = floor(-0.0) = ... well, not -0.0!
floor() in Py3 is defined to return an integer, and there is no -0 integer:
>>> floor(-0.0)
0
That's +0. So I see no justification at all for -0.0 in Py3. -1 seems the
best that can be done. The NaN I actually get doesn't make sense.
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<http://bugs.python.org/issue22198>
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