bpo-39479:Add math.lcm() function: Least Common Multiple (#18547)
* Update math.rst
* Update math.rst
* updated whats new
* Update test_math.py
* Update mathmodule.c
* Update mathmodule.c.h
* Update ACKS
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* Update 3.9.rst
* Update 2020-02-18-12-37-16.bpo-39479.j3UcCq.rst
* Update math.rst
* Update 2020-02-18-12-37-16.bpo-39479.j3UcCq.rst
* Update test_math.py
* Update ACKS
* Update mathmodule.c.h
* Update mathmodule.c
* Update mathmodule.c.h
* Update mathmodule.c.h
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diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
index b3301f6..ad8273d 100644
--- a/Lib/test/test_math.py
+++ b/Lib/test/test_math.py
@@ -974,6 +974,41 @@
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)