call __float__ on str subclasses #5759
tests by R. David Murray
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index 2b6bd78..0b1ae96 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -82,11 +82,23 @@
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 [