Support Python 3.14

flexx/__init__.py

@@ -31,8 +31,8 @@
 
 # Assert compatibility
 import sys
-if sys.version_info < (3, 5):  # pragma: no cover
-    raise RuntimeError('Flexx needs at least Python 3.5')
+if sys.version_info < (3, 8):  # pragma: no cover
+    raise RuntimeError('Flexx needs at least Python 3.8')
 
 # Import config object
 from ._config import config  # noqa

flexx/app/_server.py

@@ -118,7 +118,7 @@ def __init__(self, host, port, loop=None, **kwargs):
             # Please add comment: What is this used for??
             asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy()) 
         if loop is None:
-            self._loop = asyncio.get_event_loop()
+            self._loop = _loop.get_or_create_event_loop()
         else:
             assert isinstance(loop, asyncio.AbstractEventLoop)
             self._loop = loop
@@ -140,7 +140,7 @@ def start(self):
             raise RuntimeError('Cannot start a closed or non-serving server!')
         if self._running:
             raise RuntimeError('Cannot start a running server.')
-        if asyncio.get_event_loop() is not self._loop:
+        if _loop.get_or_create_event_loop() is not self._loop:
             raise RuntimeError('Can only start server in same thread that created it.')
         logger.info('Starting Flexx event loop.')
         # Make use of the semi-standard defined by IPython to determine

flexx/app/_session.py

@@ -277,7 +277,8 @@ def set_cookie(self, name, value, expires_days=30, version=None,
         # Clear cookie?
         if value is None:
             value = ""
-            expires = datetime.datetime.utcnow() - datetime.timedelta(days=365)
+            expires = (datetime.datetime.now(datetime.timezone.utc) -
+                       datetime.timedelta(days=365))
         else:
             secret = config.cookie_secret
             value = create_signed_value(secret, name, value, version=version,
@@ -296,8 +297,8 @@ def set_cookie(self, name, value, expires_days=30, version=None,
         if domain:
             morsel["domain"] = domain
         if expires_days is not None and not expires:
-            expires = datetime.datetime.utcnow() + datetime.timedelta(
-                days=expires_days)
+            expires = (datetime.datetime.now(datetime.timezone.utc) +
+                       datetime.timedelta(days=expires_days))
         if expires:
             morsel["expires"] = format_timestamp(expires)
         if path:

flexx/event/_loop.py

@@ -15,6 +15,24 @@ def this_is_js():
     return False
 
 
+def get_or_create_event_loop():
+    """ Get the current asyncio event loop, creating a new one if needed.
+
+    In Python 3.10+ ``asyncio.get_event_loop()`` no longer creates a loop
+    when none exists, and from Python 3.12 it raises an error in that case.
+    This helper preserves the historical behavior.
+    """
+    try:
+        return asyncio.get_running_loop()
+    except RuntimeError:
+        try:
+            return asyncio.get_event_loop()
+        except RuntimeError:
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+            return loop
+
+
 class Loop:
     """ The singleton Flexx event loop at ``flexx.event.loop``. This holds
     the queue of pending calls, actions, and reactions. These are queued
@@ -386,7 +404,7 @@ def integrate(self, loop=None, reset=True):
         (though this is currently not tested).
         """
         if loop is None:
-            loop = asyncio.get_event_loop()
+            loop = get_or_create_event_loop()
         with self._lock:
             self._thread_id = threading.get_ident()
             self._local._active_components = []

flexx/event/both_tester.py

@@ -199,7 +199,8 @@ def run_in_both(*classes, js=True, py=True, extra_nodejs_args=None):
     """
 
     def wrapper(func):
-        reference = '\n'.join(line[4:] for line in func.__doc__.splitlines())
+        reference = '\n'.join(line[4:] if line.startswith('    ') else line
+                              for line in func.__doc__.splitlines())
         parts = reference.split('-'*10)
         pyref = parts[0].strip(' \n')
         jsref = parts[-1].strip(' \n-')

setup.py

@@ -8,12 +8,7 @@
 import sys
 import shutil
 
-try:
-    import setuptools  # noqa, analysis:ignore
-except ImportError:
-    pass  # setuptools allows for "develop", but it's not essential
-
-from distutils.core import setup
+from setuptools import setup
 
 
 ## Function we need
@@ -115,7 +110,7 @@ def get_all_resources():
     long_description=doc,
     platforms='any',
     provides=[name],
-    python_requires='>=3.5',
+    python_requires='>=3.8',
     install_requires=['tornado', 'pscript>=0.7.7', 'webruntime>=0.5.6', 'dialite>=0.5.2'],
     packages=package_tree('flexx') + package_tree('flexxamples'),
     package_dir={'flexx': 'flexx', 'flexxamples': 'flexxamples'},
@@ -134,10 +129,12 @@ def get_all_resources():
         'Operating System :: POSIX',
         'Programming Language :: JavaScript',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         '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',
     ],
 )