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bpo-44339: Fix math.pow corner case to comply with IEEE 754 (GH-26606)

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Change the behaviour of `math.pow(0.0, -math.inf)` and `math.pow(-0.0, -math.inf)` to return positive infinity instead of raising `ValueError`. This makes `math.pow` consistent with the built-in `pow` (and the `**` operator) for this particular special case, and brings the `math.pow` special-case handling into compliance with IEEE 754.
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Mark Dickinson 2021-06-12 10:23:02 +01:00 • committed by GitHub
parent 3ec3ee7d2e
commit 4a42cebf6d
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6 changed files with 21 additions and 11 deletions
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Lib/test/test_math.py
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@ -1230,7 +1230,7 @@ class MathTests(unittest.TestCase):
self.assertRaises(ValueError, math.pow, 0., -2.)
self.assertRaises(ValueError, math.pow, 0., -2.3)
self.assertRaises(ValueError, math.pow, 0., -3.)
self.assertRaises(ValueError, math.pow, 0., NINF)
self.assertEqual(math.pow(0., NINF), INF)
self.assertTrue(math.isnan(math.pow(0., NAN)))
# pow(INF, x)
@ -1256,7 +1256,7 @@ class MathTests(unittest.TestCase):
self.assertRaises(ValueError, math.pow, -0., -2.)
self.assertRaises(ValueError, math.pow, -0., -2.3)
self.assertRaises(ValueError, math.pow, -0., -3.)
self.assertRaises(ValueError, math.pow, -0., NINF)
self.assertEqual(math.pow(-0., NINF), INF)
self.assertTrue(math.isnan(math.pow(-0., NAN)))
# pow(NINF, x)