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Add support for unary plus and unary minus to collections.Counter()

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This commit is contained in:
Raymond Hettinger 2011-08-09 13:00:40 -07:00
parent 18205baf25
commit fcb393c018
4 changed files with 31 additions and 1 deletions
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5
Lib/test/test_collections.py
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@ -943,6 +943,11 @@ class TestCounter(unittest.TestCase):
c.subtract('aaaabbcce')
self.assertEqual(c, Counter(a=-1, b=0, c=-1, d=1, e=-1))
def test_unary(self):
c = Counter(a=-5, b=0, c=5, d=10, e=15,g=40)
self.assertEqual(dict(+c), dict(c=5, d=10, e=15, g=40))
self.assertEqual(dict(-c), dict(a=5))
def test_helper_function(self):
# two paths, one for real dicts and one for other mappings
elems = list('abracadabra')