Improved is_future check (more performant).

syrusakbary · Aug 18, 2016 · 4ef0a69 · 4ef0a69
1 parent 480040a
commit 4ef0a69
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/promise/promise.py b/promise/promise.py
@@ -471,7 +471,7 @@ def handle_future_result(future):
 
 
 def is_future(obj):
-    return hasattr(obj, "add_done_callback") and callable(getattr(obj, "add_done_callback"))
+    return callable(getattr(obj, "add_done_callback", None))
 
 
 def is_thenable(obj):