From 3ab517e4b3a5a15659ff8c38f37e1cd504b46e05 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Sun, 24 Oct 2010 09:47:53 -0400
Subject: [PATCH] Fix cache shuffling (random.shuffle() shuffles in place,
 returns None).

---
 pysawsim/sawsim.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pysawsim/sawsim.py b/pysawsim/sawsim.py
index c0589ef..0e73940 100644
--- a/pysawsim/sawsim.py
+++ b/pysawsim/sawsim.py
@@ -208,7 +208,9 @@ class SawsimRunner (object):
 
     def _load_cached_data(self, param_string):
         pcd = self._param_cache_dir(param_string)
-        for filename in shuffle(os.listdir(pcd)):
+        filenames = os.listdir(pcd)
+        shuffle(filenames)
+        for filename in filenames:
             if not filename.endswith('.dat'):
                 continue
             with open(os.path.join(pcd, filename), 'r') as f:
-- 
2.26.2