From 2a0c9ac38106f2d3043f3cb1db9bba34a8706d77 Mon Sep 17 00:00:00 2001
From: Wes McKinney <wesmckinn@gmail.com>
Date: Fri, 9 Dec 2011 18:43:26 -0500
Subject: [PATCH] BUG: copy index slice causing memory leak described in #467

---
 pandas/core/internals.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pandas/core/internals.py b/pandas/core/internals.py
index 730e15ac63d8a..2db0e0854b07e 100644
--- a/pandas/core/internals.py
+++ b/pandas/core/internals.py
@@ -586,7 +586,8 @@ def _add_new_block(self, item, value):
 
         # hm, elaborate hack?
         loc = self.items.get_loc(item)
-        new_block = make_block(value, self.items[loc:loc+1], self.items)
+        new_block = make_block(value, self.items[loc:loc+1].copy(),
+                               self.items)
         self.blocks.append(new_block)
 
     def _find_block(self, item):