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Bug #1590891: random.randrange don't return correct value for big number

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Needs to be backported.
This commit is contained in:
Raymond Hettinger 2006-12-20 06:42:06 +00:00
parent ebbeed781d
commit 94547f7646
3 changed files with 11 additions and 1 deletions
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8
Lib/test/test_random.py
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@ -438,6 +438,14 @@ class MersenneTwister_TestBasicOps(TestBasicOps):
self.assertEqual(k, numbits) # note the stronger assertion
self.assert_(2**k > n > 2**(k-1)) # note the stronger assertion
def test_randrange_bug_1590891(self):
start = 1000000000000
stop = -100000000000000000000
step = -200
x = self.gen.randrange(start, stop, step)
self.assert_(stop < x <= start)
self.assertEqual((x+stop)%step, 0)
_gammacoeff = (0.9999999999995183, 676.5203681218835, -1259.139216722289,
771.3234287757674, -176.6150291498386, 12.50734324009056,
-0.1385710331296526, 0.9934937113930748e-05, 0.1659470187408462e-06)