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gh-121149: improve accuracy of builtin sum() for complex inputs (gh-121176)

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Sergey B Kirpichev 2024-07-05 18:01:05 +03:00 • committed by GitHub
parent cecd6012b0
commit d4faa7bd32
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4 changed files with 120 additions and 26 deletions
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9
Lib/test/test_builtin.py
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@ -1768,6 +1768,11 @@ class BuiltinTest(unittest.TestCase):
sum(([x] for x in range(10)), empty)
self.assertEqual(empty, [])
xs = [complex(random.random() - .5, random.random() - .5)
for _ in range(10000)]
self.assertEqual(sum(xs), complex(sum(z.real for z in xs),
sum(z.imag for z in xs)))
@requires_IEEE_754
@unittest.skipIf(HAVE_DOUBLE_ROUNDING,
"sum accuracy not guaranteed on machines with double rounding")
@ -1775,6 +1780,10 @@ class BuiltinTest(unittest.TestCase):
def test_sum_accuracy(self):
self.assertEqual(sum([0.1] * 10), 1.0)
self.assertEqual(sum([1.0, 10E100, 1.0, -10E100]), 2.0)
self.assertEqual(sum([1.0, 10E100, 1.0, -10E100, 2j]), 2+2j)
self.assertEqual(sum([2+1j, 10E100j, 1j, -10E100j]), 2+2j)
self.assertEqual(sum([1j, 1, 10E100j, 1j, 1.0, -10E100j]), 2+2j)
self.assertEqual(sum([0.1j]*10 + [fractions.Fraction(1, 10)]), 0.1+1j)
def test_type(self):
self.assertEqual(type(''), type('123'))