--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utils/odict.py	Tue Apr 01 10:52:51 2014 -0400
@@ -0,0 +1,85 @@
+"""
+Ordered dictionary implementation.
+"""
+
+from UserDict import UserDict
+
+class odict(UserDict):
+    """
+    http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/107747
+
+    This dictionary class extends UserDict to record the order in which items are
+    added. Calling keys(), values(), items(), etc. will return results in this
+    order.
+    """
+    def __init__( self, dict = None ):
+        self._keys = []
+        UserDict.__init__( self, dict )
+
+    def __delitem__( self, key ):
+        UserDict.__delitem__( self, key )
+        self._keys.remove( key )
+
+    def __setitem__( self, key, item ):
+        UserDict.__setitem__( self, key, item )
+        if key not in self._keys:
+            self._keys.append( key )
+
+    def clear( self ):
+        UserDict.clear( self )
+        self._keys = []
+
+    def copy(self):
+        new = odict()
+        new.update( self )
+        return new
+
+    def items( self ):
+        return zip( self._keys, self.values() )
+
+    def keys( self ):
+        return self._keys[:]
+
+    def popitem( self ):
+        try:
+            key = self._keys[-1]
+        except IndexError:
+            raise KeyError( 'dictionary is empty' )
+        val = self[ key ]
+        del self[ key ]
+        return ( key, val )
+
+    def setdefault( self, key, failobj=None ):
+        if key not in self._keys:
+            self._keys.append( key )
+        return UserDict.setdefault( self, key, failobj )
+
+    def update( self, dict ):
+        for ( key, val ) in dict.items():
+            self.__setitem__( key, val )
+
+    def values( self ):
+        return map( self.get, self._keys )
+
+    def iterkeys( self ):
+        return iter( self._keys )
+
+    def itervalues( self ):
+        for key in self._keys:
+            yield self.get( key )
+
+    def iteritems( self ):
+        for key in self._keys:
+            yield key, self.get( key )
+
+    def __iter__( self ):
+        for key in self._keys:
+            yield key
+
+    def reverse( self ):
+        self._keys.reverse()
+
+    def insert( self, index, key, item ):
+        if key not in self._keys:
+            self._keys.insert( index, key )
+            UserDict.__setitem__( self, key, item )