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Optimize dict.fromkeys() with dict inputs. Useful for resetting bag/muliset counts for example.

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This commit is contained in:
Raymond Hettinger 2007-11-07 02:26:17 +00:00
parent 12e94200c0
commit cdcf887999
2 changed files with 23 additions and 0 deletions
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4
Lib/test/test_dict.py
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@ -243,6 +243,10 @@ class DictTest(unittest.TestCase):
self.assertRaises(Exc, baddict2.fromkeys, [1])
# test fast path for dictionary inputs
d = dict(zip(range(6), range(6)))
self.assertEqual(dict.fromkeys(d, 0), dict(zip(range(6), [0]*6)))
def test_copy(self):
d = {1:1, 2:2, 3:3}
self.assertEqual(d.copy(), {1:1, 2:2, 3:3})