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| author | Mark Dickinson <mdickinson@enthought.com> | 2021-06-12 09:23:02 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-06-12 09:23:02 (GMT) |
| commit | 4a42cebf6dd769e2fa4e234a9e91093b3ad1cb63 (patch) | |
| tree | 925efc812b8810d8c5fb6c1040307d1cacf4b976 /Lib/test/test_math.py | |
| parent | 3ec3ee7d2e9b45b586e486e429b412d6d0ca530f (diff) | |
| download | cpython-4a42cebf6dd769e2fa4e234a9e91093b3ad1cb63.zip cpython-4a42cebf6dd769e2fa4e234a9e91093b3ad1cb63.tar.gz cpython-4a42cebf6dd769e2fa4e234a9e91093b3ad1cb63.tar.bz2 | |
bpo-44339: Fix math.pow corner case to comply with IEEE 754 (GH-26606)
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.
Diffstat (limited to 'Lib/test/test_math.py')
| -rw-r--r-- | Lib/test/test_math.py | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py index da16284..42b61c3 100644 --- a/Lib/test/test_math.py +++ b/Lib/test/test_math.py @@ -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) |