fix: remove unnecessary run_coro_sync() hack. (#219)

Co-authored-by: Claude Opus 4.5 <[email protected]>

Author: cpsievert

.github/workflows/pytest.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
 
     steps:

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to shinywidgets will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.7.1] - 2026-01-22
+
+* Fixed an issue where anywidget-based widgets (like plotly) failed to initialize with `websockets>=16.0`. (#218)
+
 ## [0.7.0] - 2025-07-14
 
 * `datetime.date()` values are properly JSON serialized. (#204)

setup.cfg

@@ -15,17 +15,18 @@ classifiers =
     Intended Audience :: Developers
     License :: OSI Approved :: MIT License
     Natural Language :: English
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
+    Programming Language :: Python :: 3.13
+    Programming Language :: Python :: 3.14
 project_urls =
     Bug Tracker = https://github.com/rstudio/py-shinywidgets/issues
     Documentation = https://github.com/rstudio/py-shinywidgets/
     Source Code = https://github.com/rstudio/py-shinywidgets/
 
 [options]
-python_requires = >=3.9
+python_requires = >=3.10
 packages = find:
 test_suite = tests
 include_package_data = True
@@ -46,8 +47,7 @@ test =
     pytest>=6.2.4
 dev =
     black>=23.1.0
-    flake8==3.9.2;python_version<="3.7"
-    flake8>=6.0.0;python_version>"3.7"
+    flake8>=6.0.0
     isort>=5.11.2
     pyright>=1.1.284
     wheel

shinywidgets/__init__.py

@@ -2,7 +2,7 @@
 
 __author__ = """Carson Sievert"""
 __email__ = "[email protected]"
-__version__ = "0.7.0"
+__version__ = "0.7.1"
 
 from ._as_widget import as_widget
 from ._dependencies import bokeh_dependency

shinywidgets/_comm.py

@@ -2,7 +2,6 @@
 from dataclasses import dataclass
 from typing import Callable, Dict, List, Optional
 
-from shiny._utils import run_coro_hybrid
 from shiny.session import get_current_session
 
 from ._serialization import json_packer
@@ -46,7 +45,7 @@ def __init__(
         data: DataType = None,
         metadata: MetadataType = None,
         buffers: BufferType = None,
-        **keys: object
+        **keys: object,
     ) -> None:
         self.comm_id = comm_id
         self.comm_manager = comm_manager
@@ -58,7 +57,7 @@ def open(
         data: DataType = None,
         metadata: MetadataType = None,
         buffers: BufferType = None,
-        **keys: object
+        **keys: object,
     ) -> None:
         self.comm_manager.register_comm(self)
         try:
@@ -69,7 +68,7 @@ def open(
                 buffers=buffers,
                 target_name=self.target_name,
                 target_module=None,
-                **keys
+                **keys,
             )
             self._closed = False
         except Exception:
@@ -120,7 +119,7 @@ def _publish_msg(
         data: DataType = None,
         metadata: MetadataType = None,
         buffers: BufferType = None,
-        **keys: object
+        **keys: object,
     ) -> None:
         data = {} if data is None else data
         metadata = {} if metadata is None else metadata
@@ -166,10 +165,8 @@ def _publish_msg(
 
         msg_txt = json_packer(msg)
 
-        # In theory, it seems that this send could maybe be async (that we then asyncio.create_task() with),
-        # but that might mean that messages are sent out of order, which is not what we want.
-        def _send():
-            run_coro_hybrid(session.send_custom_message(msg_type, msg_txt))  # type: ignore
+        async def _send():
+            await session.send_custom_message(msg_type, msg_txt)  # type: ignore
 
         # N.B., if messages are sent immediately, run_coro_sync() could fail with
         # 'async function yielded control; it did not finish in one iteration.'

shinywidgets/_render_widget_base.py

@@ -235,17 +235,17 @@ class WidgetRenderContext:
     def __init__(self, output_id):
         self.session = require_active_session(None)
         self.output_id = output_id
-        self._old_id = self.session.__dict__.get("__shinywidget_current_output_id")
+        self._old_id = vars(self.session).get("__shinywidget_current_output_id")
 
     def __enter__(self):
-        self.session.__dict__["__shinywidget_current_output_id"] = self.output_id
+        vars(self.session)["__shinywidget_current_output_id"] = self.output_id
         return self
 
     def __exit__(self, exc_type, exc_value, traceback):
-        self.session.__dict__["__shinywidget_current_output_id"] = self._old_id
+        vars(self.session)["__shinywidget_current_output_id"] = self._old_id
         return False
 
     @staticmethod
     def is_rendering_widget(session):
-        id = session.__dict__.get("__shinywidget_current_output_id")
+        id = vars(session).get("__shinywidget_current_output_id")
         return id is not None