From 6e4ea093e5422c9048efdea4bc40f2edf24ff99f Mon Sep 17 00:00:00 2001
From: Matthew Perry <perrygeo@gmail.com>
Date: Sun, 20 Jul 2014 13:54:02 -0700
Subject: [PATCH] ordinals in format for sake of py2.6

---
 geopandas/tools/overlay.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/geopandas/tools/overlay.py b/geopandas/tools/overlay.py
index 2794a55..e66ac9e 100644
--- a/geopandas/tools/overlay.py
+++ b/geopandas/tools/overlay.py
@@ -11,7 +11,7 @@ def _uniquify(columns):
         newcol = col
         while newcol in ucols:
             inc += 1
-            newcol = "{}_{}".format(col, inc)
+            newcol = "{0}_{1}".format(col, inc)
         ucols.append(newcol)
     return ucols