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bpo-39479:Add math.lcm() function: Least Common Multiple (#18547)

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35
Lib/test/test_math.py
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@ -974,6 +974,41 @@ def __index__(self):
with self.assertRaises(TypeError):
math.isqrt(value)
def test_lcm(self):
lcm = math.lcm
self.assertEqual(lcm(0, 0), 0)
self.assertEqual(lcm(1, 0), 0)
self.assertEqual(lcm(-1, 0), 0)
self.assertEqual(lcm(0, 1), 0)
self.assertEqual(lcm(0, -1), 0)
self.assertEqual(lcm(7, 1), 7)
self.assertEqual(lcm(7, -1), 7)
self.assertEqual(lcm(-23, 15), 345)
self.assertEqual(lcm(120, 84), 840)
self.assertEqual(lcm(84, -120), 840)
self.assertEqual(lcm(1216342683557601535506311712,
436522681849110124616458784),
16592536571065866494401400422922201534178938447014944)
x = 43461045657039990237
y = 10645022458251153277
for c in (652560,
57655923087165495981):
a = x * c
b = y * c
d = x * y * c
self.assertEqual(lcm(a, b), d)
self.assertEqual(lcm(b, a), d)
self.assertEqual(lcm(-a, b), d)
self.assertEqual(lcm(b, -a), d)
self.assertEqual(lcm(a, -b), d)
self.assertEqual(lcm(-b, a), d)
self.assertEqual(lcm(-a, -b), d)
self.assertEqual(lcm(-b, -a), d)
self.assertEqual(lcm(MyIndexable(120), MyIndexable(84)), 840)
self.assertRaises(TypeError, lcm, 120.0, 84)
self.assertRaises(TypeError, lcm, 120, 84.0)
def testLdexp(self):
self.assertRaises(TypeError, math.ldexp)
self.ftest('ldexp(0,1)', math.ldexp(0,1), 0)