From 31ecc3db86d216d0fb8687be0a41daeb5d45dd3a Mon Sep 17 00:00:00 2001
From: Vighnesh Birodkar <vighneshbirodkar@gmail.com>
Date: Fri, 17 Oct 2014 00:06:12 +0530
Subject: [PATCH] Change None to 0

---
 skimage/graph/rag.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/skimage/graph/rag.py b/skimage/graph/rag.py
index 1fd1ddc9..3200980b 100644
--- a/skimage/graph/rag.py
+++ b/skimage/graph/rag.py
@@ -62,7 +62,7 @@ class RAG(nx.Graph):
     def __init__(self, data=None, **attr):
 
         nx.Graph.__init__(self, data, **attr)
-        self.max_id = None
+        self.max_id = 0
         for n in self.nodes_iter():
             self.max_id = max(self.max_id, n)