Mercurial > cpython-lru_cache-weakref
diff Lib/test/test_float.py @ 66698:573a67276217
Issue #10596: Fix float.__mod__ to have the same behaviour as
float.__divmod__ with respect to signed zeros.
| author | Mark Dickinson <dickinsm@gmail.com> |
|---|---|
| date | Sat, 04 Dec 2010 12:25:30 +0000 |
| parents | 7b6af56ee74d |
| children | f2a4ade36a1e |
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--- a/Lib/test/test_float.py Sat Dec 04 12:20:57 2010 +0000 +++ b/Lib/test/test_float.py Sat Dec 04 12:25:30 2010 +0000 @@ -197,6 +197,26 @@ self.assertEqual((a, copysign(1.0, a)), (b, copysign(1.0, b))) @requires_IEEE_754 + def test_float_mod(self): + # Check behaviour of % operator for IEEE 754 special cases. + # In particular, check signs of zeros. + mod = operator.mod + + self.assertEqualAndEqualSign(mod(-1.0, 1.0), 0.0) + self.assertEqualAndEqualSign(mod(-1e-100, 1.0), 1.0) + self.assertEqualAndEqualSign(mod(-0.0, 1.0), 0.0) + self.assertEqualAndEqualSign(mod(0.0, 1.0), 0.0) + self.assertEqualAndEqualSign(mod(1e-100, 1.0), 1e-100) + self.assertEqualAndEqualSign(mod(1.0, 1.0), 0.0) + + self.assertEqualAndEqualSign(mod(-1.0, -1.0), -0.0) + self.assertEqualAndEqualSign(mod(-1e-100, -1.0), -1e-100) + self.assertEqualAndEqualSign(mod(-0.0, -1.0), -0.0) + self.assertEqualAndEqualSign(mod(0.0, -1.0), -0.0) + self.assertEqualAndEqualSign(mod(1e-100, -1.0), -1.0) + self.assertEqualAndEqualSign(mod(1.0, -1.0), -0.0) + + @requires_IEEE_754 def test_float_pow(self): # test builtin pow and ** operator for IEEE 754 special cases. # Special cases taken from section F.9.4.4 of the C99 specification