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bpo-37178: Allow a one argument form of math.perm() (GH-13905)

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Raymond Hettinger 2019-06-08 08:58:11 -07:00 • committed by GitHub
parent 8cc605acdd
commit e119b3d136
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6 changed files with 34 additions and 9 deletions
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9
Lib/test/test_math.py
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@ -1885,8 +1885,13 @@ class IsCloseTests(unittest.TestCase):
self.assertEqual(perm(n, 1), n)
self.assertEqual(perm(n, n), factorial(n))
# Test one argument form
for n in range(20):
self.assertEqual(perm(n), factorial(n))
self.assertEqual(perm(n, None), factorial(n))
# Raises TypeError if any argument is non-integer or argument count is
# not 2
# not 1 or 2
self.assertRaises(TypeError, perm, 10, 1.0)
self.assertRaises(TypeError, perm, 10, decimal.Decimal(1.0))
self.assertRaises(TypeError, perm, 10, "1")
@ -1894,7 +1899,7 @@ class IsCloseTests(unittest.TestCase):
self.assertRaises(TypeError, perm, decimal.Decimal(10.0), 1)
self.assertRaises(TypeError, perm, "10", 1)
self.assertRaises(TypeError, perm, 10)
self.assertRaises(TypeError, perm)
self.assertRaises(TypeError, perm, 10, 1, 3)
self.assertRaises(TypeError, perm)