X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sfa%2Frspecs%2Felements%2Felement.py;h=7dcfa007a994370cc0076eb76ac0a047ab80a4d3;hb=4a9e6751f9f396f463932133b9d62fc925a99ef6;hp=7f79e810e15a0ee7ead96122e68764019cacc5fc;hpb=fbda0e1fb1598e8b34344700feefd9abe8f1980f;p=sfa.git

diff --git a/sfa/rspecs/elements/element.py b/sfa/rspecs/elements/element.py
index 7f79e810..7dcfa007 100644
--- a/sfa/rspecs/elements/element.py
+++ b/sfa/rspecs/elements/element.py
@@ -2,15 +2,16 @@ class Element(dict):
 
     fields = {}
 
-    def __init__(self, fields={}, element=None, keys=None):
+    def __init__(self, fields=None, element=None, keys=None):
+        if fields is None:
+            fields = {}
         self.element = element
         dict.__init__(self, dict.fromkeys(self.fields))
         if not keys:
-            keys = fields.keys()
+            keys = list(fields.keys())
         for key in keys:
             if key in fields:
-                self[key] = fields[key] 
-
+                self[key] = fields[key]
 
     def __getattr__(self, name):
         if hasattr(self.__dict__, name):
@@ -18,4 +19,5 @@ class Element(dict):
         elif hasattr(self.element, name):
             return getattr(self.element, name)
         else:
-            raise AttributeError, "class Element has no attribute %s" % name
+            raise AttributeError("class Element of type {} has no attribute {}"
+                                 .format(self.__class__.__name__, name))