Restore default

codegen-server/python/src/main/kotlin/software/amazon/smithy/rust/codegen/server/python/smithy/generators/PythonApplicationGenerator.kt

@@ -89,6 +89,7 @@ class PythonApplicationGenerator(
     fun render(writer: RustWriter) {
         renderPyApplicationRustDocs(writer)
         renderAppStruct(writer)
+        renderAppDefault(writer)
         renderAppClone(writer)
         renderPyAppTrait(writer)
         renderAppImpl(writer)
@@ -129,6 +130,23 @@ class PythonApplicationGenerator(
         )
     }
 
+    private fun renderAppDefault(writer: RustWriter) {
+        writer.rustTemplate(
+            """
+            impl Default for App {
+                fn default() -> Self {
+                    Self {
+                        handlers: Default::default(),
+                        middlewares: #{SmithyPython}::PyMiddlewares::new::<#{Protocol}>(vec![]),
+                        context: None,
+                        workers: #{parking_lot}::Mutex::new(vec![]),
+                    }
+                }
+            }
+            """,
+        )
+    }
+
     private fun renderAppImpl(writer: RustWriter) {
         writer.rustBlockTemplate(
             """
@@ -218,13 +236,7 @@ class PythonApplicationGenerator(
                 /// Create a new [App].
                 ##[new]
                 pub fn new() -> Self {
-                    Self {
-                        handlers: Default::default(),
-                        middlewares: #{SmithyPython}::PyMiddlewares::new::<#{Protocol}>(vec![]),
-                        context: None,
-                        workers: #{parking_lot}::Mutex::new(vec![]),
-
-                    }
+                    Self::default()
                 }
                 /// Register a context object that will be shared between handlers.
                 ##[pyo3(text_signature = "(${'$'}self, context)")]