Do not use mutables as default values!

This blog article explains why (just an example, many other articles
discuss this ad nauseam):
http://pythonconquerstheuniverse.wordpress.com/2012/02/15/mutable-default-arguments/

lib/daemon.py

@@ -34,7 +34,9 @@ class NetworkProxy(threading.Thread):
     # connects to daemon
     # sends requests, runs callbacks
 
-    def __init__(self, config = {}):
+    def __init__(self, config=None):
+        if config is None:
+            config = {}  # Do not use mutables as default arguments!
         threading.Thread.__init__(self)
         self.daemon = True
         self.config = SimpleConfig(config) if type(config) == type({}) else config