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bpo-40541: Add optional *counts* parameter to random.sample() #19970

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Merged
rhettinger merged 10 commits into from
May 8, 2020
Merged

bpo-40541: Add optional *counts* parameter to random.sample() #19970

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4ad778b
Add weights to random.sample()
rhettinger May 6, 2020
eaed7b3
Add docs
rhettinger May 6, 2020
787ec38
Add blurb
rhettinger May 6, 2020
ab6b380
Add tests
rhettinger May 6, 2020
ea5e42e
Update Doc/library/random.rst
rhettinger May 6, 2020
672f739
Add exact equidistribution test
rhettinger May 7, 2020
556582d
Earlier test for zero total weight
rhettinger May 7, 2020
4fb554a
Change parameter name from "weights" to "counts". Add another test.
rhettinger May 7, 2020
55e948e
Sync-up docstring with the main docs
rhettinger May 7, 2020
1f36ad3
Fix typo and improve formatting
rhettinger May 8, 2020
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Add exact equidistribution test
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@rhettinger
rhettinger committed May 7, 2020
commit 672f739050b398b806a798eb598fa2eace391790
5 changes: 5 additions & 0 deletions Lib/test/test_random.py
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Expand Up @@ -186,6 +186,11 @@ def test_sample_with_weights(self):
summary = Counter(sample(['x'], weights=[10], k=8))
self.assertEqual(summary, Counter(x=8))

# Case with all weights equal.
nc = len(colors)
summary = Counter(sample(colors, weights=[10]*nc, k=10*nc))
self.assertEqual(summary, Counter(10*colors))

# Test error handling
with self.assertRaises(TypeError):
sample(['red', 'green', 'blue'], weights=10, k=10) # weights not iterable
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