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Issue #26983: float() now always return an instance of exact float.

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The deprecation warning is emitted if __float__ returns an instance of
a strict subclass of float.  In a future versions of Python this can
be an error.
This commit is contained in:
Serhiy Storchaka 2016-06-03 21:42:55 +03:00
parent bb7f7327fe
commit 16931c3559
5 changed files with 76 additions and 32 deletions
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21
Lib/test/test_float.py
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@ -161,11 +161,12 @@ class GeneralFloatCases(unittest.TestCase):
def __float__(self):
return float(str(self)) + 1
self.assertAlmostEqual(float(Foo1()), 42.)
self.assertAlmostEqual(float(Foo2()), 42.)
self.assertAlmostEqual(float(Foo3(21)), 42.)
self.assertEqual(float(Foo1()), 42.)
self.assertEqual(float(Foo2()), 42.)
with self.assertWarns(DeprecationWarning):
self.assertEqual(float(Foo3(21)), 42.)
self.assertRaises(TypeError, float, Foo4(42))
self.assertAlmostEqual(float(FooStr('8')), 9.)
self.assertEqual(float(FooStr('8')), 9.)
class Foo5:
def __float__(self):
@ -176,10 +177,14 @@ class GeneralFloatCases(unittest.TestCase):
class F:
def __float__(self):
return OtherFloatSubclass(42.)
self.assertAlmostEqual(float(F()), 42.)
self.assertIs(type(float(F())), OtherFloatSubclass)
self.assertAlmostEqual(FloatSubclass(F()), 42.)
self.assertIs(type(FloatSubclass(F())), FloatSubclass)
with self.assertWarns(DeprecationWarning):
self.assertEqual(float(F()), 42.)
with self.assertWarns(DeprecationWarning):
self.assertIs(type(float(F())), float)
with self.assertWarns(DeprecationWarning):
self.assertEqual(FloatSubclass(F()), 42.)
with self.assertWarns(DeprecationWarning):
self.assertIs(type(FloatSubclass(F())), FloatSubclass)
def test_is_integer(self):
self.assertFalse((1.1).is_integer())