Continue rolling back pep-3141 changes that changed behavior from 2.5. This
round included:
* Revert round to its 2.6 behavior (half away from 0).
* Because round, floor, and ceil always return float again, it's no
longer necessary to have them delegate to __xxx___, so I've ripped
that out of their implementations and the Real ABC. This also helps
in implementing types that work in both 2.6 and 3.0: you return int
from the __xxx__ methods, and let it get enabled by the version
upgrade.
* Make pow(-1, .5) raise a ValueError again.
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 255fb96..d56e6ff 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1456,13 +1456,12 @@
else:
self.assertAlmostEqual(pow(x, y, z), 24.0)
- self.assertAlmostEqual(pow(-1, 0.5), 1j)
- self.assertAlmostEqual(pow(-1, 1./3), 0.5 + 0.8660254037844386j)
-
self.assertRaises(TypeError, pow, -1, -2, 3)
self.assertRaises(ValueError, pow, 1, 2, 0)
self.assertRaises(TypeError, pow, -1L, -2L, 3L)
self.assertRaises(ValueError, pow, 1L, 2L, 0L)
+ # Will return complex in 3.0:
+ self.assertRaises(ValueError, pow, -342.43, 0.234)
self.assertRaises(TypeError, pow)
@@ -1664,11 +1663,11 @@
self.assertEqual(type(round(-8.0, 0)), float)
self.assertEqual(type(round(-8.0, 1)), float)
- # Check even / odd rounding behaviour
+ # Check half rounding behaviour.
self.assertEqual(round(5.5), 6)
- self.assertEqual(round(6.5), 6)
+ self.assertEqual(round(6.5), 7)
self.assertEqual(round(-5.5), -6)
- self.assertEqual(round(-6.5), -6)
+ self.assertEqual(round(-6.5), -7)
# Check behavior on ints
self.assertEqual(round(0), 0)
@@ -1686,8 +1685,8 @@
# test generic rounding delegation for reals
class TestRound(object):
- def __round__(self):
- return 23
+ def __float__(self):
+ return 23.0
class TestNoRound(object):
pass
@@ -1695,13 +1694,12 @@
self.assertEqual(round(TestRound()), 23)
self.assertRaises(TypeError, round, 1, 2, 3)
- # XXX: This is not ideal, but see the comment in builtin_round().
- self.assertRaises(AttributeError, round, TestNoRound())
+ self.assertRaises(TypeError, round, TestNoRound())
t = TestNoRound()
- t.__round__ = lambda *args: args
- self.assertEquals((), round(t))
- self.assertEquals((0,), round(t, 0))
+ t.__float__ = lambda *args: args
+ self.assertRaises(TypeError, round, t)
+ self.assertRaises(TypeError, round, t, 0)
def test_setattr(self):
setattr(sys, 'spam', 1)