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author | Raymond Hettinger <python@rcn.com> | 2006-12-20 06:42:06 (GMT) |
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committer | Raymond Hettinger <python@rcn.com> | 2006-12-20 06:42:06 (GMT) |
commit | 94547f7646895e032f8fc145529d9efc3a70760d (patch) | |
tree | b3bd1dec4781ba00953d8e57b6d8e84fa3d06e91 /Lib/test/test_random.py | |
parent | ebbeed781d923494f782f0750e76ad4aac8e29f5 (diff) | |
download | cpython-94547f7646895e032f8fc145529d9efc3a70760d.zip cpython-94547f7646895e032f8fc145529d9efc3a70760d.tar.gz cpython-94547f7646895e032f8fc145529d9efc3a70760d.tar.bz2 |
Bug #1590891: random.randrange don't return correct value for big number
Needs to be backported.
Diffstat (limited to 'Lib/test/test_random.py')
-rw-r--r-- | Lib/test/test_random.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py index e3f05a0..ddbcc2f 100644 --- a/Lib/test/test_random.py +++ b/Lib/test/test_random.py @@ -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) |