Added namelookup.

zipline/utils/protocol_utils.py

@@ -152,3 +152,23 @@ class ndict(MutableMapping):
                 #return False
 
         #return True
+
+# This is not neccesarily the most intuitive construction, but
+# we're aiming for raw performance rather than readability. So
+# we do things that we would not normally do in business logic.
+def namelookup(dct):
+    ks = dct.keys()
+    vs = dct.values()
+    dct = {}
+    class _lookup:
+        __slots__ = ks
+        def __init__(self):
+            for k, v in zip(ks, vs):
+                setattr(self,k,v)
+            self.__setattr__ = self.locked
+        def locked(self,k,v):
+            raise Exception('Name lookups are fixed at init.')
+        def __repr__(self):
+            return '<namelookup %s>' % self.__slots__
+    del dct
+    return _lookup()