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Issue #8644: Improve accuracy of timedelta.total_seconds, by doing intermediate

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computations with integer arithmetic instead of floating point.
td.total_seconds() now agrees with td / timedelta(seconds = 1).

Thanks Alexander Belopolsky for the patch.
This commit is contained in:
Mark Dickinson 2010-05-08 14:35:02 +00:00
parent 161b024b6d
commit 0381e3f16a
4 changed files with 33 additions and 4 deletions
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5
Lib/test/test_datetime.py
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@ -264,6 +264,11 @@ class TestTimeDelta(HarmlessMixedComparison, unittest.TestCase):
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,