diff --git a/corrlib/tools.py b/corrlib/tools.py
index a912731..a150520 100644
--- a/corrlib/tools.py
+++ b/corrlib/tools.py
@@ -1,11 +1,9 @@
 
 
 
-def str2list(s):
-    return s.split(",")
+def str2list(string):
+    return string.split(",")
 
-def list2str(l):
-    s = l[0]
-    for it in l[1:]:
-        s += ',' + it
+def list2str(mylist):
+    s = ",".join(mylist)
     return s
\ No newline at end of file