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Issue #18844: Make the various ways for specifing weights produce the same results.

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Raymond Hettinger 2016-10-29 16:55:36 -07:00
parent ab5cf4da4e
commit 30d00e54dd
3 changed files with 23 additions and 3 deletions
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16
Lib/test/test_random.py
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@ -629,6 +629,22 @@ class MersenneTwister_TestBasicOps(TestBasicOps, unittest.TestCase):
self.assertTrue(stop < x <= start)
self.assertEqual((x+stop)%step, 0)
def test_choices_algorithms(self):
# The various ways of specifing weights should produce the same results
choices = self.gen.choices
n = 13132817
self.gen.seed(8675309)
a = self.gen.choices(range(n), k=10000)
self.gen.seed(8675309)
b = self.gen.choices(range(n), [1]*n, k=10000)
self.assertEqual(a, b)
self.gen.seed(8675309)
c = self.gen.choices(range(n), cum_weights=range(1, n+1), k=10000)
self.assertEqual(a, c)
def gamma(z, sqrt2pi=(2.0*pi)**0.5):
# Reflection to right half of complex plane
if z < 0.5: