From fea3aec6bd0ef0ff9290c07657099c8eb305657d Mon Sep 17 00:00:00 2001
From: Lin <lynschinzer@gmail.com>
Date: Fri, 5 Dec 2014 17:13:12 +0800
Subject: [PATCH] Fix divided by zero issue in case of words are not found in
 dict.

---
 jieba/analyse/textrank.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/jieba/analyse/textrank.py b/jieba/analyse/textrank.py
index 739c60e..ad91fa0 100644
--- a/jieba/analyse/textrank.py
+++ b/jieba/analyse/textrank.py
@@ -21,7 +21,7 @@ class UndirectWeightedGraph:
         ws = collections.defaultdict(float)
         outSum = collections.defaultdict(float)
 
-        wsdef = 1.0 / len(self.graph)
+        wsdef = 1.0 / (len(self.graph) or 1.0)
         for n, out in self.graph.items():
             ws[n] = wsdef
             outSum[n] = sum((e[2] for e in out), 0.0)