Drop Python 3.9

.github/dependabot.yml

@@ -5,11 +5,12 @@
 
 version: 2
 updates:
-  - package-ecosystem: "uv"
+  - package-ecosystem: "pip"
     # Enable version updates for development dependencies
     directory: "/"
     schedule:
       interval: "monthly"
+    versioning-strategy: "increase-if-necessary"
     groups:
       dev-deps:
         patterns:
@@ -23,4 +24,4 @@ updates:
     groups:
       github-actions:
         patterns:
-          - "*"
+          - "*"

.github/workflows/ci.yml

@@ -21,7 +21,6 @@ jobs:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
         env: [
-          "py39",
           "py310",
           "py311",
           "py312",

README.rst

@@ -61,6 +61,7 @@ Library Version                 Python
   4.0+                          3.7+
   4.3+                          3.8+
   4.6+                          3.9+
+  main branch                   3.10+
 ==============================  ===========
 
 

can/_entry_points.py

@@ -1,5 +1,4 @@
 import importlib
-import sys
 from dataclasses import dataclass
 from importlib.metadata import entry_points
 from typing import Any
@@ -16,19 +15,7 @@ def load(self) -> Any:
         return getattr(module, self.class_name)
 
 
-# See https://docs.python.org/3/library/importlib.metadata.html#entry-points,
-# "Compatibility Note".
-if sys.version_info >= (3, 10):
-
-    def read_entry_points(group: str) -> list[_EntryPoint]:
-        return [
-            _EntryPoint(ep.name, ep.module, ep.attr) for ep in entry_points(group=group)
-        ]
-
-else:
-
-    def read_entry_points(group: str) -> list[_EntryPoint]:
-        return [
-            _EntryPoint(ep.name, *ep.value.split(":", maxsplit=1))
-            for ep in entry_points().get(group, [])  # pylint: disable=no-member
-        ]
+def read_entry_points(group: str) -> list[_EntryPoint]:
+    return [
+        _EntryPoint(ep.name, ep.module, ep.attr) for ep in entry_points(group=group)
+    ]

can/broadcastmanager.py

@@ -12,13 +12,10 @@
 import threading
 import time
 import warnings
-from collections.abc import Sequence
+from collections.abc import Callable, Sequence
 from typing import (
     TYPE_CHECKING,
-    Callable,
     Final,
-    Optional,
-    Union,
     cast,
 )
 
@@ -78,7 +75,7 @@ def wait_inf(self, event: _Pywin32Event) -> None:
         )
 
 
-PYWIN32: Optional[_Pywin32] = None
+PYWIN32: _Pywin32 | None = None
 if sys.platform == "win32" and sys.version_info < (3, 11):
     try:
         PYWIN32 = _Pywin32()
@@ -105,9 +102,7 @@ class CyclicSendTaskABC(CyclicTask, abc.ABC):
     Message send task with defined period
     """
 
-    def __init__(
-        self, messages: Union[Sequence[Message], Message], period: float
-    ) -> None:
+    def __init__(self, messages: Sequence[Message] | Message, period: float) -> None:
         """
         :param messages:
             The messages to be sent periodically.
@@ -125,7 +120,7 @@ def __init__(
 
     @staticmethod
     def _check_and_convert_messages(
-        messages: Union[Sequence[Message], Message],
+        messages: Sequence[Message] | Message,
     ) -> tuple[Message, ...]:
         """Helper function to convert a Message or Sequence of messages into a
         tuple, and raises an error when the given value is invalid.
@@ -164,9 +159,9 @@ def _check_and_convert_messages(
 class LimitedDurationCyclicSendTaskABC(CyclicSendTaskABC, abc.ABC):
     def __init__(
         self,
-        messages: Union[Sequence[Message], Message],
+        messages: Sequence[Message] | Message,
         period: float,
-        duration: Optional[float],
+        duration: float | None,
     ) -> None:
         """Message send task with a defined duration and period.
 
@@ -181,7 +176,7 @@ def __init__(
         """
         super().__init__(messages, period)
         self.duration = duration
-        self.end_time: Optional[float] = None
+        self.end_time: float | None = None
 
 
 class RestartableCyclicTaskABC(CyclicSendTaskABC, abc.ABC):
@@ -215,7 +210,7 @@ def _check_modified_messages(self, messages: tuple[Message, ...]) -> None:
                 "from when the task was created"
             )
 
-    def modify_data(self, messages: Union[Sequence[Message], Message]) -> None:
+    def modify_data(self, messages: Sequence[Message] | Message) -> None:
         """Update the contents of the periodically sent messages, without
         altering the timing.
 
@@ -242,7 +237,7 @@ class MultiRateCyclicSendTaskABC(CyclicSendTaskABC, abc.ABC):
     def __init__(
         self,
         channel: typechecking.Channel,
-        messages: Union[Sequence[Message], Message],
+        messages: Sequence[Message] | Message,
         count: int,  # pylint: disable=unused-argument
         initial_period: float,  # pylint: disable=unused-argument
         subsequent_period: float,
@@ -272,12 +267,12 @@ def __init__(
         self,
         bus: "BusABC",
         lock: threading.Lock,
-        messages: Union[Sequence[Message], Message],
+        messages: Sequence[Message] | Message,
         period: float,
-        duration: Optional[float] = None,
-        on_error: Optional[Callable[[Exception], bool]] = None,
+        duration: float | None = None,
+        on_error: Callable[[Exception], bool] | None = None,
         autostart: bool = True,
-        modifier_callback: Optional[Callable[[Message], None]] = None,
+        modifier_callback: Callable[[Message], None] | None = None,
     ) -> None:
         """Transmits `messages` with a `period` seconds for `duration` seconds on a `bus`.
 
@@ -298,13 +293,13 @@ def __init__(
         self.bus = bus
         self.send_lock = lock
         self.stopped = True
-        self.thread: Optional[threading.Thread] = None
+        self.thread: threading.Thread | None = None
         self.on_error = on_error
         self.modifier_callback = modifier_callback
 
         self.period_ms = int(round(period * 1000, 0))
 
-        self.event: Optional[_Pywin32Event] = None
+        self.event: _Pywin32Event | None = None
         if PYWIN32:
             if self.period_ms == 0:
                 # A period of 0 would mean that the timer is signaled only once
@@ -338,7 +333,7 @@ def start(self) -> None:
             self.thread = threading.Thread(target=self._run, name=name)
             self.thread.daemon = True
 
-            self.end_time: Optional[float] = (
+            self.end_time: float | None = (
                 time.perf_counter() + self.duration if self.duration else None
             )
 

can/bus.py

@@ -6,14 +6,11 @@
 import logging
 import threading
 from abc import ABC, abstractmethod
-from collections.abc import Iterator, Sequence
+from collections.abc import Callable, Iterator, Sequence
 from enum import Enum, auto
 from time import time
 from types import TracebackType
 from typing import (
-    Callable,
-    Optional,
-    Union,
     cast,
 )
 
@@ -68,7 +65,7 @@ class BusABC(ABC):
     def __init__(
         self,
         channel: can.typechecking.Channel,
-        can_filters: Optional[can.typechecking.CanFilters] = None,
+        can_filters: can.typechecking.CanFilters | None = None,
         **kwargs: object,
     ):
         """Construct and open a CAN bus instance of the specified type.
@@ -101,7 +98,7 @@ def __init__(
     def __str__(self) -> str:
         return self.channel_info
 
-    def recv(self, timeout: Optional[float] = None) -> Optional[Message]:
+    def recv(self, timeout: float | None = None) -> Message | None:
         """Block waiting for a message from the Bus.
 
         :param timeout:
@@ -139,9 +136,7 @@ def recv(self, timeout: Optional[float] = None) -> Optional[Message]:
 
                 return None
 
-    def _recv_internal(
-        self, timeout: Optional[float]
-    ) -> tuple[Optional[Message], bool]:
+    def _recv_internal(self, timeout: float | None) -> tuple[Message | None, bool]:
         """
         Read a message from the bus and tell whether it was filtered.
         This methods may be called by :meth:`~can.BusABC.recv`
@@ -184,7 +179,7 @@ def _recv_internal(
         raise NotImplementedError("Trying to read from a write only bus?")
 
     @abstractmethod
-    def send(self, msg: Message, timeout: Optional[float] = None) -> None:
+    def send(self, msg: Message, timeout: float | None = None) -> None:
         """Transmit a message to the CAN bus.
 
         Override this method to enable the transmit path.
@@ -205,12 +200,12 @@ def send(self, msg: Message, timeout: Optional[float] = None) -> None:
 
     def send_periodic(
         self,
-        msgs: Union[Message, Sequence[Message]],
+        msgs: Message | Sequence[Message],
         period: float,
-        duration: Optional[float] = None,
+        duration: float | None = None,
         store_task: bool = True,
         autostart: bool = True,
-        modifier_callback: Optional[Callable[[Message], None]] = None,
+        modifier_callback: Callable[[Message], None] | None = None,
     ) -> can.broadcastmanager.CyclicSendTaskABC:
         """Start sending messages at a given period on this bus.
 
@@ -297,11 +292,11 @@ def wrapped_stop_method(remove_task: bool = True) -> None:
 
     def _send_periodic_internal(
         self,
-        msgs: Union[Sequence[Message], Message],
+        msgs: Sequence[Message] | Message,
         period: float,
-        duration: Optional[float] = None,
+        duration: float | None = None,
         autostart: bool = True,
-        modifier_callback: Optional[Callable[[Message], None]] = None,
+        modifier_callback: Callable[[Message], None] | None = None,
     ) -> can.broadcastmanager.CyclicSendTaskABC:
         """Default implementation of periodic message sending using threading.
 
@@ -378,20 +373,18 @@ def __iter__(self) -> Iterator[Message]:
                 yield msg
 
     @property
-    def filters(self) -> Optional[can.typechecking.CanFilters]:
+    def filters(self) -> can.typechecking.CanFilters | None:
         """
         Modify the filters of this bus. See :meth:`~can.BusABC.set_filters`
         for details.
         """
         return self._filters
 
     @filters.setter
-    def filters(self, filters: Optional[can.typechecking.CanFilters]) -> None:
+    def filters(self, filters: can.typechecking.CanFilters | None) -> None:
         self.set_filters(filters)
 
-    def set_filters(
-        self, filters: Optional[can.typechecking.CanFilters] = None
-    ) -> None:
+    def set_filters(self, filters: can.typechecking.CanFilters | None = None) -> None:
         """Apply filtering to all messages received by this Bus.
 
         All messages that match at least one filter are returned.
@@ -417,7 +410,7 @@ def set_filters(
         with contextlib.suppress(NotImplementedError):
             self._apply_filters(self._filters)
 
-    def _apply_filters(self, filters: Optional[can.typechecking.CanFilters]) -> None:
+    def _apply_filters(self, filters: can.typechecking.CanFilters | None) -> None:
         """
         Hook for applying the filters to the underlying kernel or
         hardware if supported/implemented by the interface.
@@ -484,9 +477,9 @@ def __enter__(self) -> Self:
 
     def __exit__(
         self,
-        exc_type: Optional[type[BaseException]],
-        exc_value: Optional[BaseException],
-        traceback: Optional[TracebackType],
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
     ) -> None:
         self.shutdown()