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Document which part of the random module module are guaranteed.

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Raymond Hettinger 2010-09-07 00:38:15 +00:00
parent 435cb0f233
commit f763a728ad
4 changed files with 44 additions and 12 deletions
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17
Lib/test/test_random.py
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@ -39,7 +39,7 @@ class TestBasicOps(unittest.TestCase):
self.gen.seed(arg)
for arg in [list(range(3)), dict(one=1)]:
self.assertRaises(TypeError, self.gen.seed, arg)
self.assertRaises(TypeError, self.gen.seed, 1, 2)
self.assertRaises(TypeError, self.gen.seed, 1, 2, 3, 4)
self.assertRaises(TypeError, type(self.gen), [])
def test_sample(self):
@ -223,6 +223,21 @@ class SystemRandom_TestBasicOps(TestBasicOps):
class MersenneTwister_TestBasicOps(TestBasicOps):
gen = random.Random()
def test_guaranteed_stable(self):
# These sequences are guaranteed to stay the same across versions of python
self.gen.seed(3456147, version=1)
self.assertEqual([self.gen.random().hex() for i in range(4)],
['0x1.ac362300d90d2p-1', '0x1.9d16f74365005p-1',
'0x1.1ebb4352e4c4dp-1', '0x1.1a7422abf9c11p-1'])
self.gen.seed("the quick brown fox", version=1)
self.assertEqual([self.gen.random().hex() for i in range(4)],
['0x1.9ee265c177cdep-2', '0x1.bad51092e3c25p-1',
'0x1.85ff833f71576p-1', '0x1.87efb37462927p-1'])
self.gen.seed("the quick brown fox", version=2)
self.assertEqual([self.gen.random().hex() for i in range(4)],
['0x1.1294009b9eda4p-2', '0x1.2ff96171b0010p-1',
'0x1.459e0989bd8e0p-5', '0x1.8b5f55892ddcbp-1'])
def test_setstate_first_arg(self):
self.assertRaises(ValueError, self.gen.setstate, (1, None, None))