Merged revisions 87032 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k
........
r87032 | mark.dickinson | 2010-12-04 12:25:30 +0000 (Sat, 04 Dec 2010) | 3 lines
Issue #10596: Fix float.__mod__ to have the same behaviour as
float.__divmod__ with respect to signed zeros.
........
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index 9d68da7..e16be06 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -162,6 +162,26 @@
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