Issue 6370: Performance issue with collections.Counter().
diff --git a/Lib/collections.py b/Lib/collections.py
index 1e807af..abf6f89 100644
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -418,13 +418,15 @@
if iterable is not None:
if isinstance(iterable, Mapping):
if self:
+ self_get = self.get
for elem, count in iterable.iteritems():
- self[elem] += count
+ self[elem] = self_get(elem, 0) + count
else:
dict.update(self, iterable) # fast path when counter is empty
else:
+ self_get = self.get
for elem in iterable:
- self[elem] += 1
+ self[elem] = self_get(elem, 0) + 1
if kwds:
self.update(kwds)