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bpo-36018: Make __pos__ return a distinct instance of NormDist #12009

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Merged
merged 1 commit into from
Feb 24, 2019
Merged

bpo-36018: Make __pos__ return a distinct instance of NormDist #12009

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2 changes: 1 addition & 1 deletion Lib/statistics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -762,7 +762,7 @@ def __truediv__(x1, x2):
return NormalDist(x1.mu / x2, x1.sigma / fabs(x2))

def __pos__(x1):
return x1
return NormalDist(x1.mu, x1.sigma)

def __neg__(x1):
return NormalDist(-x1.mu, x1.sigma)
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12 changes: 12 additions & 0 deletions Lib/test/test_statistics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2128,6 +2128,18 @@ def test_cdf(self):
with self.assertRaises(statistics.StatisticsError):
Y.cdf(90)

def test_unary_operations(self):
NormalDist = statistics.NormalDist
X = NormalDist(100, 12)
Y = +X
self.assertIsNot(X, Y)
self.assertEqual(X.mu, Y.mu)
self.assertEqual(X.sigma, Y.sigma)
Y = -X
self.assertIsNot(X, Y)
self.assertEqual(X.mu, -Y.mu)
self.assertEqual(X.sigma, Y.sigma)

def test_same_type_addition_and_subtraction(self):
NormalDist = statistics.NormalDist
X = NormalDist(100, 12)
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