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bpo-24567: Random subnormal.diff (#7954)

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Handle subnormal weights for choices()
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Raymond Hettinger 2018-06-27 01:08:31 -07:00 • committed by GitHub
parent 3c8043d8fa
commit ddf7171911
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3 changed files with 13 additions and 1 deletions
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8
Lib/test/test_random.py
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@ -227,6 +227,14 @@ class TestBasicOps:
with self.assertRaises(IndexError):
choices([], cum_weights=[], k=5)
def test_choices_subnormal(self):
# Subnormal weights would occassionally trigger an IndexError
# in choices() when the value returned by random() was large
# enough to make `random() * total` round up to the total.
# See https://bugs.python.org/msg275594 for more detail.
choices = self.gen.choices
choices(population=[1, 2], weights=[1e-323, 1e-323], k=5000)
def test_gauss(self):
# Ensure that the seed() method initializes all the hidden state. In
# particular, through 2.2.1 it failed to reset a piece of state used