On Wed, 30 Aug 2017 20:46:54 -0400, Terry Reedy wrote: > On 8/30/2017 1:35 PM, Terry Reedy wrote: >> https://stackoverflow.com/questions/45965545/math-sqrt-domain-error- when-square-rooting-a-positive-number [...]
> Three people have reported that math.sqrt(1.3) works in 32 bit Python on > 64-bit Windows and no one otherwise. I reported back on SO that the > problem is likely local. Thanks for the responses. I wouldn't entirely rule out a bug yet. Do the Python Devs have a windows build-bot? If so, perhaps: - it is currently failing, and nobody noticed; - it's not failing, because the tests don't cover this case. The tests for sqrt are not exactly extensive, and the poster on SO reports sqrt only fails on *some* numbers, not all. https://github.com/python/cpython/blob/master/Lib/test/test_math.py def testSqrt(self): self.assertRaises(TypeError, math.sqrt) self.ftest('sqrt(0)', math.sqrt(0), 0) self.ftest('sqrt(1)', math.sqrt(1), 1) self.ftest('sqrt(4)', math.sqrt(4), 2) self.assertEqual(math.sqrt(INF), INF) self.assertRaises(ValueError, math.sqrt, -1) self.assertRaises(ValueError, math.sqrt, NINF) self.assertTrue(math.isnan(math.sqrt(NAN))) As far as I can see, apart from tests for NAN and ±INF, there are no tests of math.sqrt on floats at all. -- Steven D'Aprano “You are deluded if you think software engineers who can't write operating systems or applications without security holes, can write virtualization layers without security holes.” —Theo de Raadt -- https://mail.python.org/mailman/listinfo/python-list
