minor performance optimization

jjtolton · Nov 11, 2017 · 26b64a1 · 26b64a1
1 parent 574031d
commit 26b64a1
Showing 1 changed file with 12 additions and 7 deletions.
diff --git a/naga/tools.py b/naga/tools.py
@@ -556,13 +556,18 @@ def update_in(d, key_list, fn, *args, **kwargs):
 
 
 def dispatch(x, dispatch_table=None):
-    Table = dispatch_table or (fpartial(isinstance, collections.MutableMapping), Dict,
-                               fpartial(isinstance, str), String,
-                               fpartial(isinstance, list), List,
-                               fpartial(isinstance, tuple), Tuple,
-                               lambda _: True, type(x))
-
-    return cond(x, *Table)
+    Table = {dict: lambda: Dict,
+             list: lambda: List,
+             str: lambda: String,
+             tuple: lambda: Tuple}
+
+    Lookup = dispatch_table or (fpartial(isinstance, collections.MutableMapping), Dict,
+                                fpartial(isinstance, str), String,
+                                fpartial(isinstance, list), List,
+                                fpartial(isinstance, tuple), Tuple,
+                                lambda _: True, type(x))
+
+    return Table.get(type(x), lambda: cond(x, *Lookup))()
 
 
 def recursive_dict_merge(*ds):