From: Raymond Hettinger <python@rcn.com>
Date: Thu, 5 May 2011 21:34:35 +0000 (-0700)
Subject: Userlist.copy() wasn't returning a UserList.
X-Git-Tag: v3.3.0a1~2392
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=1c7b7f7fbeb79eaddcd21b20a43802db0f7790a1;p=python

Userlist.copy() wasn't returning a UserList.
---

diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index 53e3dd7fa2..4b447ace34 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -887,7 +887,7 @@ class UserList(MutableSequence):
     def pop(self, i=-1): return self.data.pop(i)
     def remove(self, item): self.data.remove(item)
     def clear(self): self.data.clear()
-    def copy(self): return self.data.copy()
+    def copy(self): return self.__class__(self)
     def count(self, item): return self.data.count(item)
     def index(self, item, *args): return self.data.index(item, *args)
     def reverse(self): self.data.reverse()
diff --git a/Lib/test/test_userlist.py b/Lib/test/test_userlist.py
index 868ed24ccc..6381070f56 100644
--- a/Lib/test/test_userlist.py
+++ b/Lib/test/test_userlist.py
@@ -52,6 +52,12 @@ class UserListTest(list_tests.CommonTest):
                 return str(key) + '!!!'
         self.assertEqual(next(iter(T((1,2)))), "0!!!")
 
+    def test_userlist_copy(self):
+        u = self.type2test([6, 8, 1, 9, 1])
+        v = u.copy()
+        self.assertEqual(u, v)
+        self.assertEqual(type(u), type(v))
+
 def test_main():
     support.run_unittest(UserListTest)