[Python-checkins] cpython (3.1): Fix minor subclassing issue with collections.Counter
raymond.hettinger
python-checkins at python.org
Fri Apr 15 22:23:19 CEST 2011
http://hg.python.org/cpython/rev/a164f67d27be
changeset: 69379:a164f67d27be
branch: 3.1
parent: 69374:1d6e28df2fb7
user: Raymond Hettinger <python at rcn.com>
date: Fri Apr 15 13:16:46 2011 -0700
summary:
Fix minor subclassing issue with collections.Counter
files:
Lib/collections.py | 4 ++--
Lib/test/test_collections.py | 9 +++++++++
Misc/NEWS | 2 ++
3 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/Lib/collections.py b/Lib/collections.py
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -459,8 +459,8 @@
self.update(kwds)
def copy(self):
- 'Like dict.copy() but returns a Counter instance instead of a dict.'
- return Counter(self)
+ 'Return a shallow copy.'
+ return self.__class__(self)
def __reduce__(self):
return self.__class__, (dict(self),)
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -680,6 +680,15 @@
self.assertEqual(len(dup), len(words))
self.assertEqual(type(dup), type(words))
+ def test_copy_subclass(self):
+ class MyCounter(Counter):
+ pass
+ c = MyCounter('slartibartfast')
+ d = c.copy()
+ self.assertEqual(d, c)
+ self.assertEqual(len(d), len(c))
+ self.assertEqual(type(d), type(c))
+
def test_conversions(self):
# Convert to: set, list, dict
s = 'she sells sea shells by the sea shore'
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -58,6 +58,8 @@
- Issue #11467: Fix urlparse behavior when handling urls which contains scheme
specific part only digits. Patch by Santoso Wijaya.
+- collections.Counter().copy() now works correctly for subclasses.
+
- Issue #11474: Fix the bug with url2pathname() handling of '/C|/' on Windows.
Patch by Santoso Wijaya.
--
Repository URL: http://hg.python.org/cpython
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