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Diffstat (limited to 'Lib/test/test_long.py')
| -rw-r--r-- | Lib/test/test_long.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py index 7ce37e8..c97842b 100644 --- a/Lib/test/test_long.py +++ b/Lib/test/test_long.py @@ -1016,6 +1016,17 @@ class LongTest(unittest.TestCase): self.assertEqual((a+1).bit_length(), i+1) self.assertEqual((-a-1).bit_length(), i+1) + def test_bit_count(self): + for a in range(-1000, 1000): + self.assertEqual(a.bit_count(), bin(a).count("1")) + + for exp in [10, 17, 63, 64, 65, 1009, 70234, 1234567]: + a = 2**exp + self.assertEqual(a.bit_count(), 1) + self.assertEqual((a - 1).bit_count(), exp) + self.assertEqual((a ^ 63).bit_count(), 7) + self.assertEqual(((a - 1) ^ 510).bit_count(), exp - 8) + def test_round(self): # check round-half-even algorithm. For round to nearest ten; # rounding map is invariant under adding multiples of 20 |