bpo-36018: Make __pos__ return a distinct instance of NormDist (GH-12009)
https://bugs.python.org/issue36018
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@ -762,7 +762,7 @@ class NormalDist:
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return NormalDist(x1.mu / x2, x1.sigma / fabs(x2))
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def __pos__(x1):
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return x1
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return NormalDist(x1.mu, x1.sigma)
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def __neg__(x1):
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return NormalDist(-x1.mu, x1.sigma)
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@ -2128,6 +2128,18 @@ class TestNormalDist(unittest.TestCase):
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with self.assertRaises(statistics.StatisticsError):
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Y.cdf(90)
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def test_unary_operations(self):
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NormalDist = statistics.NormalDist
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X = NormalDist(100, 12)
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Y = +X
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self.assertIsNot(X, Y)
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self.assertEqual(X.mu, Y.mu)
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self.assertEqual(X.sigma, Y.sigma)
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Y = -X
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self.assertIsNot(X, Y)
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self.assertEqual(X.mu, -Y.mu)
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self.assertEqual(X.sigma, Y.sigma)
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def test_same_type_addition_and_subtraction(self):
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NormalDist = statistics.NormalDist
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X = NormalDist(100, 12)
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