From 4c5bdd443871b4a2a5a88abd4a1dddf1242cc10b Mon Sep 17 00:00:00 2001
From: Zhuoran Han <zhuoranhan@Zhuorans-MacBook-Pro.local>
Date: Wed, 16 May 2018 14:54:24 -0400
Subject: [PATCH] Checkvalue bug

---
 openmc/checkvalue.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openmc/checkvalue.py b/openmc/checkvalue.py
index 3b334319f6..4a82983d96 100644
--- a/openmc/checkvalue.py
+++ b/openmc/checkvalue.py
@@ -265,7 +265,7 @@ def check_filetype_version(obj, expected_type, expected_version):
         if this_version[0] != expected_version:
             raise IOError('{} file has a version of {} which is not '
                           'consistent with the version expected by OpenMC, {}'
-                          .format(this_filetype, '.'.join(this_version),
+                          .format(this_filetype, '.'.join(str(v) for v in this_version),
                                   expected_version))
     except AttributeError:
         raise IOError('Could not read {} file. This most likely means the {} '