Change default to show a better example. Current code is fine

theano/configparser.py

@@ -98,7 +98,7 @@ class change_flags(object):
 
     Useful during tests.
     """
-    def __init__(self, args=[], **kwargs):
+    def __init__(self, args=(), **kwargs):
         confs = dict()
         args = dict(args)
         args.update(kwargs)