DOC: tweak example class

tacaswell · tacaswell · commit bc9385a79efa · 2020-05-16T18:39:54.000-04:00
diff --git a/tutorials/intermediate/blitting.py b/tutorials/intermediate/blitting.py
@@ -85,7 +85,7 @@
 
 class BlitManager:
 
-    def __init__(self, canvas, animated_artists):
+    def __init__(self, canvas, animated_artists=()):
         """
         Parameters
         ----------
@@ -94,7 +94,7 @@ def __init__(self, canvas, animated_artists):
             canvas which have the `~CanvasAgg.copy_from_bbox` and
             `~CanvasAgg.restore_region` methods.
 
-        animated_artists : Optional[List[Artist]]
+        animated_artists : Iterable[Artist]
             List of the artists to manage
         """
         self.canvas = canvas
