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author | Mariatta Wijaya <mariatta.wijaya@gmail.com> | 2017-02-06 20:16:58 -0800 |
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committer | Mariatta Wijaya <mariatta.wijaya@gmail.com> | 2017-02-06 20:16:58 -0800 |
commit | da79bcf8ac7ae72218ab023e1ed54390bc1a3a27 (patch) | |
tree | 74845e2dbd9521d9748b9c32f1922f4123083bf3 /Lib/test/test_set.py | |
parent | e3c7e835bdfc97750eb9b7fc0ad2493108c2d438 (diff) | |
parent | 1fe806ac56f8b83694d24ab604eb695d00bc8497 (diff) | |
download | cpython-da79bcf8ac7ae72218ab023e1ed54390bc1a3a27.tar.gz |
Issue #29371: merge with 3.5
Diffstat (limited to 'Lib/test/test_set.py')
-rw-r--r-- | Lib/test/test_set.py | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py index 7594303132..0202981d67 100644 --- a/Lib/test/test_set.py +++ b/Lib/test/test_set.py @@ -6,10 +6,11 @@ import operator import copy import pickle from random import randrange, shuffle -import sys import warnings import collections import collections.abc +import itertools +import string class PassThru(Exception): pass @@ -729,6 +730,25 @@ class TestFrozenSet(TestJointOps, unittest.TestCase): addhashvalue(hash(frozenset([e for e, m in elemmasks if m&i]))) self.assertEqual(len(hashvalues), 2**n) + def zf_range(n): + # https://en.wikipedia.org/wiki/Set-theoretic_definition_of_natural_numbers + nums = [frozenset()] + for i in range(n-1): + num = frozenset(nums) + nums.append(num) + return nums[:n] + + def powerset(s): + for i in range(len(s)+1): + yield from map(frozenset, itertools.combinations(s, i)) + + for n in range(18): + t = 2 ** n + mask = t - 1 + for nums in (range, zf_range): + u = len({h & mask for h in map(hash, powerset(nums(n)))}) + self.assertGreater(4*u, t) + class FrozenSetSubclass(frozenset): pass |