Issue 6370: Performance issue with collections.Counter().
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@ -418,13 +418,15 @@ class Counter(dict):
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if iterable is not None:
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if isinstance(iterable, Mapping):
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if self:
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self_get = self.get
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for elem, count in iterable.iteritems():
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self[elem] += count
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self[elem] = self_get(elem, 0) + count
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else:
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dict.update(self, iterable) # fast path when counter is empty
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else:
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self_get = self.get
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for elem in iterable:
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self[elem] += 1
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self[elem] = self_get(elem, 0) + 1
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if kwds:
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self.update(kwds)
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