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call __float__ on str subclasses #5759

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tests by R. David Murray
This commit is contained in:
Benjamin Peterson 2009-04-15 21:26:36 +00:00
parent 5c9914899b
commit 99d36f1563
3 changed files with 17 additions and 1 deletions
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12
Lib/test/test_float.py
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@ -82,11 +82,23 @@ class GeneralFloatCases(unittest.TestCase):
def __float__(self):
return 42
# Issue 5759: __float__ not called on str subclasses (though it is on
# unicode subclasses).
class FooStr(str):
def __float__(self):
return float(str(self)) + 1
class FooUnicode(unicode):
def __float__(self):
return float(unicode(self)) + 1
self.assertAlmostEqual(float(Foo0()), 42.)
self.assertAlmostEqual(float(Foo1()), 42.)
self.assertAlmostEqual(float(Foo2()), 42.)
self.assertAlmostEqual(float(Foo3(21)), 42.)
self.assertRaises(TypeError, float, Foo4(42))
self.assertAlmostEqual(float(FooUnicode('8')), 9.)
self.assertAlmostEqual(float(FooStr('8')), 9.)
def test_floatasratio(self):
for f, ratio in [