✨ Example for Textualize/textual#3878

init_override.py

@@ -0,0 +1,32 @@
+"""https://github.com/Textualize/textual/issues/3878"""
+
+from textual.app import App, ComposeResult
+from textual.reactive import var
+from textual.widgets import Label, Log
+
+class SomeWidget(Label):
+
+    test_1: var[int] = var(0)
+    test_2: var[int] = var(0, init=False)
+
+    def watch_test_1(self, was: int, into: int) -> None:
+        self.screen.query_one(Log).write_line(f"test_1 {was} -> {into}")
+
+    def watch_test_2(self, was: int, into: int) -> None:
+        self.screen.query_one(Log).write_line(f"test_2 {was} -> {into}")
+
+class InitOverrideApp(App[None]):
+
+    def compose(self) -> ComposeResult:
+        yield SomeWidget()
+        yield Log()
+
+    def on_mount(self) -> None:
+        def gndn() -> None:
+            return
+        self.watch(self.query_one(SomeWidget), "test_2", gndn)
+
+if __name__ == "__main__":
+    InitOverrideApp().run()
+
+### init_override.py ends here