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Added copysign(x, y) function to the math module

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This commit is contained in:
Christian Heimes 2008-01-03 22:32:26 +00:00
parent 000a074c95
commit eebb79cc69
4 changed files with 28 additions and 1 deletions
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7
Lib/test/test_math.py
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@ -229,6 +229,13 @@ class MathTests(unittest.TestCase):
self.ftest('tanh(0)', math.tanh(0), 0)
self.ftest('tanh(1)+tanh(-1)', math.tanh(1)+math.tanh(-1), 0)
def testCopysign(self):
self.assertEqual(math.copysign(1, 42), 1.0)
self.assertEqual(math.copysign(0., 42), 0.0)
self.assertEqual(math.copysign(1., -42), -1.0)
self.assertEqual(math.copysign(3, 0.), 3.0)
self.assertEqual(math.copysign(4., -0.), -4.0)
def testIsnan(self):
self.assert_(math.isnan(float("nan")))
self.assert_(math.isnan(float("inf")* 0.))