From 5708ff9d777dc4264af39b043b6c173db149be85 Mon Sep 17 00:00:00 2001
From: Sam Shaner <shaner@mit.edu>
Date: Thu, 20 Oct 2016 09:46:29 -0400
Subject: [PATCH] converted isotopes from iterator to list for python 3
 compatibility

---
 openmc/material.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/openmc/material.py b/openmc/material.py
index bdb5519c6b..71dd9076e7 100644
--- a/openmc/material.py
+++ b/openmc/material.py
@@ -475,6 +475,7 @@ class Material(object):
             # Get the isotopes and their natural abundances
             isotopes, abundances = zip(*element.expand())
             abundances = list(abundances)
+            isotopes = list(isotopes)
             n_isotopes = len(isotopes)
 
             # Create a list of atomic masses