FeodorFitsner · Oct 29, 2026 · Oct 28, 2026 · Oct 28, 2026 · Oct 28, 2026 · Oct 28, 2026
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -82,6 +82,7 @@ jobs:
         build_system: ['cocoapods', 'spm']
     env:
       SERIOUS_PYTHON_VERSION: ${{ matrix.python_version }}
+      BRIDGE_EXAMPLE_TEST_PYDANTIC: "1"
     steps:
       - name: Checkout repository
         uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
@@ -124,7 +125,7 @@ jobs:
           if [ "${{ matrix.build_system }}" = "cocoapods" ]; then
             export SERIOUS_PYTHON_DARWIN_SPM=false
           fi
-          dart run serious_python:main package app/src --platform Darwin --python-version ${{ matrix.python_version }}
+          dart run serious_python:main package app/src --platform Darwin --python-version ${{ matrix.python_version }} --requirements "pydantic>=2,<3"
           if [ "${{ matrix.build_system }}" = "spm" ]; then
             export SP_NATIVE_SET="$(cat build/.serious_python_spm_key)"
           fi
@@ -370,6 +371,7 @@ jobs:
         python_version: ['3.12', '3.13', '3.14']
     env:
       SERIOUS_PYTHON_VERSION: ${{ matrix.python_version }}
+      BRIDGE_EXAMPLE_TEST_PYDANTIC: "1"
     steps:
       - name: Checkout repository
         uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
@@ -397,7 +399,7 @@ jobs:
         working-directory: "src/serious_python/example/bridge_example"
         shell: bash
         run: |
-          dart run serious_python:main package app/src --platform Windows --python-version ${{ matrix.python_version }}
+          dart run serious_python:main package app/src --platform Windows --python-version ${{ matrix.python_version }} --requirements "pydantic>=2,<3"
           # bash + pipefail so the test step actually fails when flutter fails
           # (default PowerShell shell on windows runners eats the failure when
           # piping into tail).
@@ -446,6 +448,7 @@ jobs:
             title: ARM64
     env:
       SERIOUS_PYTHON_VERSION: ${{ matrix.python_version }}
+      BRIDGE_EXAMPLE_TEST_PYDANTIC: "1"
     steps:
       - name: Checkout repository
         uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
@@ -498,7 +501,8 @@ jobs:
           flutter pub get
           dart run serious_python:main package app/src \
             --platform Linux \
-            --python-version ${{ matrix.python_version }}
+            --python-version ${{ matrix.python_version }} \
+            --requirements "pydantic>=2,<3"
           set -o pipefail
 
           # Three back-to-back `xvfb-run` invocations race for display

diff --git a/src/serious_python/CHANGELOG.md b/src/serious_python/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 6.1.2
+
+* Windows Debug builds (`flutter test`, `flutter run`) use the release CPython, so compiled packages such as `pydantic-core` or `numpy` import there ([#261](https://github.com/flet-dev/serious-python/pull/261), [flet-dev/flet#7020](https://github.com/flet-dev/flet/discussions/7020)).
+* Fix native Python extension imports on Linux, including `pydantic-core`, which failed with unresolved CPython symbols such as `PyExc_RecursionError` ([#261](https://github.com/flet-dev/serious-python/pull/261)).
+
 ## 6.1.1
 
 * Release Windows apps no longer ship Python's debug modules (`*_d.pyd`), about 10 MB each ([#260](https://github.com/flet-dev/serious-python/pull/260)).

diff --git a/src/serious_python/example/bridge_example/app/src/main.py b/src/serious_python/example/bridge_example/app/src/main.py
@@ -85,6 +85,25 @@ def _emit(event: dict) -> None:
     dart_bridge.send_bytes(control_port, json.dumps(event).encode("utf-8"))
 
 
+# Desktop CI packages Pydantic v2 to exercise its native pydantic-core wheel.
+# Validate before registering handlers so a failure prevents test readiness.
+if os.environ.get("BRIDGE_EXAMPLE_TEST_PYDANTIC") == "1":
+    try:
+        from pydantic import BaseModel
+
+        class DependencyProbe(BaseModel):
+            value: int
+
+        assert DependencyProbe.model_validate({"value": "42"}).value == 42
+        print("[bridge_example] Pydantic native extension validation passed", flush=True)
+    except Exception:
+        import traceback
+
+        # Native stderr is not forwarded by every integration-test runner.
+        _emit({"event": "startup_error", "message": traceback.format_exc()})
+        raise
+
+
 def on_control(payload: bytes) -> None:
     global counter
     if not payload:

diff --git a/src/serious_python/example/bridge_example/integration_test/_helpers.dart b/src/serious_python/example/bridge_example/integration_test/_helpers.dart
@@ -23,6 +23,9 @@ Future<app.BridgeExampleHandle> bootAndAwaitReady(WidgetTester tester) async {
   // readiness signal for the control channel.
   final deadline = DateTime.now().add(const Duration(seconds: 30));
   while (handle.pythonVersion.value == null) {
+    if (handle.startupError != null) {
+      throw StateError('Python startup failed:\n${handle.startupError}');
+    }
     if (DateTime.now().isAfter(deadline)) {
       throw TimeoutException(
           'Python control handler never responded with version event');

diff --git a/src/serious_python/example/bridge_example/lib/main.dart b/src/serious_python/example/bridge_example/lib/main.dart
@@ -38,6 +38,9 @@ class BridgeExampleHandle {
   /// event arrives.
   final ValueNotifier<String?> pythonVersion = ValueNotifier<String?>(null);
 
+  /// Startup traceback sent over the bridge when a dependency check fails.
+  String? startupError;
+
   /// Send a JSON control op (Dart → Python) on the control channel.
   void sendControl(Map<String, dynamic> op) {
     final bytes = Uint8List.fromList(utf8.encode(jsonEncode(op)));
@@ -72,15 +75,6 @@ void main() {
   BridgeExampleHandle._instance =
       BridgeExampleHandle._(control, echo);
 
-  // Fire-and-forget: Python's main.py blocks forever waiting for messages.
-  // Awaiting SeriousPython.run() would deadlock the UI.
-  unawaited(SeriousPython.run(
-    environmentVariables: {
-      _controlPortEnv: '${control.port}',
-      _echoPortEnv: '${echo.port}',
-    },
-  ));
-
   runApp(const BridgeExampleApp());
 }
 
@@ -101,6 +95,15 @@ class _BridgeExampleAppState extends State<BridgeExampleApp> {
     final handle = BridgeExampleHandle.instance;
     _controlSub = handle.controlBridge.messages.listen(_onControl);
 
+    // Subscribe before starting Python so even an immediate startup failure
+    // reaches the test harness. main.py blocks forever, so don't await it.
+    unawaited(SeriousPython.run(
+      environmentVariables: {
+        _controlPortEnv: '${handle.controlBridge.port}',
+        _echoPortEnv: '${handle.echoBridge.port}',
+      },
+    ));
+
     // Request the Python version once Python has had a moment to register
     // its handler. sendControl() retries internally if the handler isn't
     // ready yet, so we can fire immediately.
@@ -123,6 +126,8 @@ class _BridgeExampleAppState extends State<BridgeExampleApp> {
       handle.counter.value = msg['value'] as int;
     } else if (event == 'version') {
       handle.pythonVersion.value = msg['value'] as String;
+    } else if (event == 'startup_error') {
+      handle.startupError = msg['message'] as String;
     }
     // 'mem' events are consumed by the memory test directly via its own
     // listener — no widget-visible state for them.

diff --git a/src/serious_python/example/flask_example/pubspec.lock b/src/serious_python/example/flask_example/pubspec.lock
@@ -361,42 +361,42 @@ packages:
       path: "../.."
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_android:
     dependency: transitive
     description:
       path: "../../../serious_python_android"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_darwin:
     dependency: transitive
     description:
       path: "../../../serious_python_darwin"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_linux:
     dependency: transitive
     description:
       path: "../../../serious_python_linux"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_platform_interface:
     dependency: transitive
     description:
       path: "../../../serious_python_platform_interface"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_windows:
     dependency: transitive
     description:
       path: "../../../serious_python_windows"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   shelf:
     dependency: transitive
     description:

diff --git a/src/serious_python/example/run_example/pubspec.lock b/src/serious_python/example/run_example/pubspec.lock
@@ -384,42 +384,42 @@ packages:
       path: "../.."
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_android:
     dependency: transitive
     description:
       path: "../../../serious_python_android"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_darwin:
     dependency: transitive
     description:
       path: "../../../serious_python_darwin"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_linux:
     dependency: transitive
     description:
       path: "../../../serious_python_linux"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_platform_interface:
     dependency: transitive
     description:
       path: "../../../serious_python_platform_interface"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   serious_python_windows:
     dependency: transitive
     description:
       path: "../../../serious_python_windows"
       relative: true
     source: path
-    version: "6.1.1"
+    version: "6.1.2"
   shelf:
     dependency: transitive
     description:

diff --git a/src/serious_python/pubspec.yaml b/src/serious_python/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python
 description: A cross-platform plugin for adding embedded Python runtime to your Flutter apps.
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 6.1.1
+version: 6.1.2
 
 platforms:
   ios:

diff --git a/src/serious_python_android/CHANGELOG.md b/src/serious_python_android/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 6.1.2
+
+* Align with the serious_python **6.1.2** release ([#261](https://github.com/flet-dev/serious-python/pull/261)).
+
 ## 6.1.1
 
 * Align with the serious_python **6.1.1** release ([#260](https://github.com/flet-dev/serious-python/pull/260)).

diff --git a/src/serious_python_android/android/build.gradle.kts b/src/serious_python_android/android/build.gradle.kts
@@ -21,7 +21,7 @@ buildscript {
 }
 
 group = "com.flet.serious_python_android"
-version = "6.1.1"
+version = "6.1.2"
 
 rootProject.allprojects {
     repositories {

diff --git a/src/serious_python_android/pubspec.yaml b/src/serious_python_android/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_android
 description: Android implementation of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 6.1.1
+version: 6.1.2
 
 environment:
   sdk: ">=3.0.0 <4.0.0"

diff --git a/src/serious_python_darwin/CHANGELOG.md b/src/serious_python_darwin/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 6.1.2
+
+* Align with the serious_python **6.1.2** release ([#261](https://github.com/flet-dev/serious-python/pull/261)).
+
 ## 6.1.1
 
 * Align with the serious_python **6.1.1** release ([#260](https://github.com/flet-dev/serious-python/pull/260)).

diff --git a/src/serious_python_darwin/darwin/serious_python_darwin.podspec b/src/serious_python_darwin/darwin/serious_python_darwin.podspec
@@ -4,7 +4,7 @@
 #
 Pod::Spec.new do |s|
   s.name             = 'serious_python_darwin'
-  s.version          = '6.1.1'
+  s.version          = '6.1.2'
   s.summary          = 'A cross-platform plugin for adding embedded Python runtime to your Flutter apps.'
   s.description      = <<-DESC
   A cross-platform plugin for adding embedded Python runtime to your Flutter apps.

diff --git a/src/serious_python_darwin/pubspec.yaml b/src/serious_python_darwin/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_darwin
 description: iOS and macOS implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 6.1.1
+version: 6.1.2
 
 environment:
   # The Swift Package Manager build path needs Flutter 3.44 / Dart 3.11 (the

diff --git a/src/serious_python_linux/CHANGELOG.md b/src/serious_python_linux/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 6.1.2
+
+* Fix native Python extension imports, including `pydantic-core`, which failed with unresolved CPython symbols such as `PyExc_RecursionError` ([#261](https://github.com/flet-dev/serious-python/pull/261)).
+
 ## 6.1.1
 
 * Align with the serious_python **6.1.1** release ([#260](https://github.com/flet-dev/serious-python/pull/260)).

diff --git a/src/serious_python_linux/pubspec.yaml b/src/serious_python_linux/pubspec.yaml
@@ -2,7 +2,7 @@ name: serious_python_linux
 description: Linux implementations of the serious_python plugin
 homepage: https://flet.dev
 repository: https://github.com/flet-dev/serious-python
-version: 6.1.1
+version: 6.1.2
 
 environment:
   sdk: '>=3.1.3 <4.0.0'

diff --git a/src/serious_python_platform_interface/CHANGELOG.md b/src/serious_python_platform_interface/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 6.1.2
+
+* On Windows, open `dart_bridge.dll` in Debug builds too, instead of `dart_bridge_d.dll` ([#261](https://github.com/flet-dev/serious-python/pull/261), [flet-dev/flet#7020](https://github.com/flet-dev/flet/discussions/7020)).
+* On Linux, load the bridge and its CPython dependencies with global symbol visibility so native Python extension wheels can resolve the CPython API ([#261](https://github.com/flet-dev/serious-python/pull/261)).
+
 ## 6.1.1
 
 * Align with the serious_python **6.1.1** release ([#260](https://github.com/flet-dev/serious-python/pull/260)).