Issue #14521: Make result of float('nan') and float('-nan') more consistent across platforms. Further, don't rely on Py_HUGE_VAL for float('inf').
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index dc0c291..3cee383 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -870,6 +870,19 @@
self.assertFalse(NAN.is_inf())
self.assertFalse((0.).is_inf())
+ def test_inf_signs(self):
+ self.assertEqual(copysign(1.0, float('inf')), 1.0)
+ self.assertEqual(copysign(1.0, float('-inf')), -1.0)
+
+ @unittest.skipUnless(getattr(sys, 'float_repr_style', '') == 'short',
+ "applies only when using short float repr style")
+ def test_nan_signs(self):
+ # When using the dtoa.c code, the sign of float('nan') should
+ # be predictable.
+ self.assertEqual(copysign(1.0, float('nan')), 1.0)
+ self.assertEqual(copysign(1.0, float('-nan')), -1.0)
+
+
fromHex = float.fromhex
toHex = float.hex
class HexFloatTestCase(unittest.TestCase):