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Issue #20478: avoid special casing Counter in statistics

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Passing Counter objects to the Counter constructor is
special cased, going through iter() firsts ensures they
are handled the same way as any other iterable.

(Committing on Steven's behalf as I don't believe his
SSH key is registered yet)
This commit is contained in:
Nick Coghlan 2014-02-08 19:44:16 +10:00
parent ec1c8097c1
commit bfd68bf4ac
3 changed files with 12 additions and 3 deletions
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8
Lib/test/test_statistics.py
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@ -1355,6 +1355,14 @@ class TestMode(NumericTestCase, AverageMixin, UnivariateTypeMixin):
# collections.Counter, which accepts None and returns an empty dict.
self.assertRaises(TypeError, self.func, None)
def test_counter_data(self):
# Test that a Counter is treated like any other iterable.
data = collections.Counter([1, 1, 1, 2])
# Since the keys of the counter are treated as data points, not the
# counts, this should raise.
self.assertRaises(statistics.StatisticsError, self.func, data)
# === Tests for variances and standard deviations ===