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bpo-44698: Restore complex pow behaviour for small integral exponents (GH-27772) (GH-27796)

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(cherry picked from commit 4b9a2dcf19)

Co-authored-by: Mark Dickinson <mdickinson@enthought.com>
This commit is contained in:
Miss Islington (bot) 2021-08-17 10:38:03 -07:00 • committed by GitHub
parent f6bd1ca166
commit 3f81e9628f
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3 changed files with 37 additions and 21 deletions
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28
Lib/test/test_complex.py
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@ -269,6 +269,34 @@ class ComplexTest(unittest.TestCase):
except OverflowError:
pass
def test_pow_with_small_integer_exponents(self):
# Check that small integer exponents are handled identically
# regardless of their type.
values = [
complex(5.0, 12.0),
complex(5.0e100, 12.0e100),
complex(-4.0, INF),
complex(INF, 0.0),
]
exponents = [-19, -5, -3, -2, -1, 0, 1, 2, 3, 5, 19]
for value in values:
for exponent in exponents:
with self.subTest(value=value, exponent=exponent):
try:
int_pow = value**exponent
except OverflowError:
int_pow = "overflow"
try:
float_pow = value**float(exponent)
except OverflowError:
float_pow = "overflow"
try:
complex_pow = value**complex(exponent)
except OverflowError:
complex_pow = "overflow"
self.assertEqual(str(float_pow), str(int_pow))
self.assertEqual(str(complex_pow), str(int_pow))
def test_boolcontext(self):
for i in range(100):
self.assertTrue(complex(random() + 1e-6, random() + 1e-6))