From d6e8d5eddbca7154d008f7ef49efdc62dded7794 Mon Sep 17 00:00:00 2001
From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Tue, 4 Mar 2014 10:59:27 -0500
Subject: [PATCH] - Fixed bug in association proxy where assigning an empty
 slice (e.g. ``x[:] = [...]``) would fail on Py3k.

---
 doc/build/changelog/changelog_09.rst   | 6 ++++++
 lib/sqlalchemy/ext/associationproxy.py | 5 +++--
 test/ext/test_associationproxy.py      | 7 +++++++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/doc/build/changelog/changelog_09.rst b/doc/build/changelog/changelog_09.rst
index e11710e61b..1591872cdf 100644
--- a/doc/build/changelog/changelog_09.rst
+++ b/doc/build/changelog/changelog_09.rst
@@ -14,6 +14,12 @@
 .. changelog::
     :version: 0.9.4
 
+    .. change::
+        :tags: bug, ext, py3k
+
+        Fixed bug in association proxy where assigning an empty slice
+        (e.g. ``x[:] = [...]``) would fail on Py3k.
+
     .. change::
         :tags: bug, general
         :tickets: 2979
diff --git a/lib/sqlalchemy/ext/associationproxy.py b/lib/sqlalchemy/ext/associationproxy.py
index a4786de42d..045645f866 100644
--- a/lib/sqlalchemy/ext/associationproxy.py
+++ b/lib/sqlalchemy/ext/associationproxy.py
@@ -540,11 +540,12 @@ class _AssociationList(_AssociationCollection):
                 stop = index.stop
             step = index.step or 1
 
+            start = index.start or 0
             rng = list(range(index.start or 0, stop, step))
             if step == 1:
                 for i in rng:
-                    del self[index.start]
-                i = index.start
+                    del self[start]
+                i = start
                 for item in value:
                     self.insert(i, item)
                     i += 1
diff --git a/test/ext/test_associationproxy.py b/test/ext/test_associationproxy.py
index 4878506019..6a4de0f746 100644
--- a/test/ext/test_associationproxy.py
+++ b/test/ext/test_associationproxy.py
@@ -212,6 +212,13 @@ class _CollectionOperations(fixtures.TestBase):
         self.assert_(p1.children == after)
         self.assert_([c.name for c in p1._children] == after)
 
+        p1.children[:] = ['d', 'e']
+        after = ['d', 'e']
+        self.assert_(p1.children == after)
+        self.assert_([c.name for c in p1._children] == after)
+
+        p1.children[:] = ['a', 'b']
+
         p1.children += ['c']
         after = ['a', 'b', 'c']
         self.assert_(p1.children == after)
-- 
2.47.3