Issue #8644: Improve accuracy of timedelta.total_seconds, by doing intermediate
computations with integer arithmetic instead of floating point.
td.total_seconds() now agrees with td / timedelta(seconds = 1).
Thanks Alexander Belopolsky for the patch.
diff --git a/Lib/test/test_datetime.py b/Lib/test/test_datetime.py
index a5b53fb..f65fbca 100644
--- a/Lib/test/test_datetime.py
+++ b/Lib/test/test_datetime.py
@@ -264,6 +264,11 @@
for total_seconds in [123456.789012, -123456.789012, 0.123456, 0, 1e6]:
td = timedelta(seconds=total_seconds)
self.assertEqual(td.total_seconds(), total_seconds)
+ # Issue8644: Test that td.total_seconds() has the same
+ # accuracy as td / timedelta(seconds=1).
+ for ms in [-1, -2, -123]:
+ td = timedelta(microseconds=ms)
+ self.assertEqual(td.total_seconds(), td / timedelta(seconds=1))
def test_carries(self):
t1 = timedelta(days=100,