huge cleanup for removing mutables used as default

[sfa.git] / sfa / storage / record.py

diff --git a/sfa/storage/record.py b/sfa/storage/record.py
index 1aa3aa9..9fcab19 100644 (file)
--- a/sfa/storage/record.py
+++ b/sfa/storage/record.py
@@ -33,15 +33,16 @@ class Record:
         # fallback
         return "** undef_datetime **"
     
-    # it may be important to exclude relationships
-    def todict (self, exclude_types=[]):
+    # it may be important to exclude relationships, which fortunately
+    # 
+    def todict (self, exclude_types=None):
+        if exclude_types is None: exclude_types=[]
         d=self.__dict__
         def exclude (k,v):
             if k.startswith('_'): return True
             if exclude_types:
                 for exclude_type in exclude_types:
                     if isinstance (v,exclude_type): return True
-                    if isinstance (v,list) and v and isinstance (v[0],exclude_type) : return True
             return False
         keys=[k for (k,v) in d.items() if not exclude(k,v)]
         return dict ( [ (k,d[k]) for k in keys ] )