huge cleanup for removing mutables used as default

[sfa.git] / sfa / rspecs / versions / sfav1.py

diff --git a/sfa/rspecs/versions/sfav1.py b/sfa/rspecs/versions/sfav1.py
index 4ee8a4c..6e973e7 100644 (file)
--- a/sfa/rspecs/versions/sfav1.py
+++ b/sfa/rspecs/versions/sfav1.py
@@ -59,7 +59,8 @@ class SFAv1(RSpecVersion):
 
     # Slivers
    
-    def add_slivers(self, hostnames, attributes=[], sliver_urn=None, append=False):
+    def add_slivers(self, hostnames, attributes=None, sliver_urn=None, append=False):
+        if attributes is None: attributes=[]
         # add slice name to network tag
         network_tags = self.xml.xpath('//network')
         if network_tags: