Merge pull request #3369 from ytausch/expose-noupdate

feat: Expose NoUpdate type

Author: T4rk1n

CHANGELOG.md

@@ -4,6 +4,9 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ## [UNRELEASED]
 
+## Added
+- [#3369](https://github.com/plotly/dash/pull/3369) Expose `dash.NoUpdate` type
+
 ## Fixed
 - [#3353](https://github.com/plotly/dash/pull/3353) Support pattern-matching/dict ids in `dcc.Loading` `target_components`
 

dash/__init__.py

@@ -26,6 +26,7 @@
     get_relative_path,
     strip_relative_path,
 )
+from ._no_update import NoUpdate  # noqa: F401,E402
 from .background_callback import (  # noqa: F401,E402
     CeleryManager,
     DiskcacheManager,
@@ -86,6 +87,7 @@ def _jupyter_nbextension_paths():
     "page_registry",
     "Dash",
     "no_update",
+    "NoUpdate",
     "page_container",
     "Patch",
     "jupyter_dash",

dash/_no_update.py

@@ -4,6 +4,8 @@ def to_plotly_json(self):  # pylint: disable=no-self-use
 
     @staticmethod
     def is_no_update(obj):
-        return isinstance(obj, NoUpdate) or (
-            isinstance(obj, dict) and obj == {"_dash_no_update": "_dash_no_update"}
+        return (
+            obj is NoUpdate
+            or isinstance(obj, NoUpdate)
+            or (isinstance(obj, dict) and obj == {"_dash_no_update": "_dash_no_update"})
         )