https://github.com/python/cpython/commit/db81ba1393af40ba920a996651e2c11943c... commit: db81ba1393af40ba920a996651e2c11943c3663c branch: master author: Raymond Hettinger <rhettinger@users.noreply.github.com> committer: GitHub <noreply@github.com> date: 2019-04-28T21:31:55-07:00 summary: bpo-36546: More tests: type preservation and equal inputs (#13000) files: M Lib/test/test_statistics.py diff --git a/Lib/test/test_statistics.py b/Lib/test/test_statistics.py index c988d7fd8be7..0a967055f0fe 100644 --- a/Lib/test/test_statistics.py +++ b/Lib/test/test_statistics.py @@ -2153,12 +2153,11 @@ def test_specific_cases(self): ]: self.assertEqual(expected, quantiles(data, n=n)) self.assertEqual(len(quantiles(data, n=n)), n - 1) - self.assertEqual(list(map(float, expected)), - quantiles(map(Decimal, data), n=n)) - self.assertEqual(list(map(Decimal, expected)), - quantiles(map(Decimal, data), n=n)) - self.assertEqual(list(map(Fraction, expected)), - quantiles(map(Fraction, data), n=n)) + # Preserve datatype when possible + for datatype in (float, Decimal, Fraction): + result = quantiles(map(datatype, data), n=n) + self.assertTrue(all(type(x) == datatype) for x in result) + self.assertEqual(result, list(map(datatype, expected))) # Invariant under tranlation and scaling def f(x): return 3.5 * x - 1234.675 @@ -2199,12 +2198,11 @@ def test_specific_cases_inclusive(self): ]: self.assertEqual(expected, quantiles(data, n=n, method="inclusive")) self.assertEqual(len(quantiles(data, n=n, method="inclusive")), n - 1) - self.assertEqual(list(map(float, expected)), - quantiles(map(Decimal, data), n=n, method="inclusive")) - self.assertEqual(list(map(Decimal, expected)), - quantiles(map(Decimal, data), n=n, method="inclusive")) - self.assertEqual(list(map(Fraction, expected)), - quantiles(map(Fraction, data), n=n, method="inclusive")) + # Preserve datatype when possible + for datatype in (float, Decimal, Fraction): + result = quantiles(map(datatype, data), n=n, method="inclusive") + self.assertTrue(all(type(x) == datatype) for x in result) + self.assertEqual(result, list(map(datatype, expected))) # Invariant under tranlation and scaling def f(x): return 3.5 * x - 1234.675 @@ -2222,6 +2220,14 @@ def f(x): self.assertTrue(all(math.isclose(e, a, abs_tol=0.0001) for e, a in zip(expected, actual))) + def test_equal_inputs(self): + quantiles = statistics.quantiles + for n in range(2, 10): + data = [10.0] * n + self.assertEqual(quantiles(data), [10.0, 10.0, 10.0]) + self.assertEqual(quantiles(data, method='inclusive'), + [10.0, 10.0, 10.0]) + def test_equal_sized_groups(self): quantiles = statistics.quantiles total = 10_000