From da3f023b2d0c0f8a080f5dfd79e76018f20605d2 Mon Sep 17 00:00:00 2001
From: jcushman <jcushman@gmail.com>
Date: Fri, 22 Jun 2012 16:36:33 -0300
Subject: [PATCH] Use set instead of list for Plane's internal collection of
 objects.

---
 pdfminer/utils.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pdfminer/utils.py b/pdfminer/utils.py
index ab5664c..9b0fc29 100644
--- a/pdfminer/utils.py
+++ b/pdfminer/utils.py
@@ -246,7 +246,7 @@ class ObjIdRange(object):
 class Plane(object):
 
     def __init__(self, objs=None, gridsize=50):
-        self._objs = []
+        self._objs = set()
         self._grid = {}
         self.gridsize = gridsize
         if objs is not None:
@@ -281,7 +281,7 @@ class Plane(object):
             else:
                 r = self._grid[k]
             r.append(obj)
-        self._objs.append(obj)
+        self._objs.add(obj)
         return
 
     # remove(obj): displace an object.