nidaqmx: Restore Python 3.9 support for internal testing

.github/workflows/run_unit_tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", "pypy3.10", "pypy3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14", "3.14t", "pypy3.10", "pypy3.11"]
       # Fail-fast skews the pass/fail ratio and seems to make pytest produce
       # incomplete JUnit XML results.
       fail-fast: false

CHANGELOG.md

@@ -34,7 +34,6 @@ All notable changes to this project will be documented in this file.
     * [862: docs tox env fails on rdss-nidaqmxbot-win-10-py32](https://github.com/ni/nidaqmx-python/issues/862)
 
 * ### Major Changes
-    * Removed support for Python 3.9.
     * (IN PROGRESS behind "WAVEFORM_SUPPORT" feature toggle) Added support for reading and writing Waveform data through gRPC using [NI gRPC Device Server](https://github.com/ni/grpc-device).
 
 * ### Known Issues

README.rst

@@ -55,7 +55,7 @@ system.
 Python Version Support
 ----------------------
 
-**nidaqmx** supports CPython 3.10+.
+**nidaqmx** supports CPython 3.9+.
 
 **nidaqmx** supports PyPy3 for non-gRPC use cases. For the status of PyPy support for gRPC,
 see `PyPy support (grpc/grpc#4221) <https://github.com/grpc/grpc/issues/4221>`_.

examples/synchronization/multi_function/cont_ai_ci_tdms_sync.py

@@ -6,6 +6,8 @@
 3. Log data from multiple tasks to a single TDMS file
 """
 
+from __future__ import annotations
+
 import os
 import queue
 import threading

generated/nidaqmx/__init__.py

@@ -1,5 +1,7 @@
 """The NI-DAQmx API for Python."""
 
+from importlib.metadata import version
+
 from nidaqmx.errors import (
     DaqError,
     DaqReadError,
@@ -12,11 +14,6 @@
 from nidaqmx.task import Task
 from nidaqmx.types import CtrFreq, CtrTick, CtrTime
 
-try:
-    from importlib.metadata import version
-except ImportError:
-    from importlib_metadata import version  # type: ignore[no-redef]
-
 __version__ = version(__name__)
 
 __all__ = [  # noqa: F405 - 'errors' may be undefined, or defined from star imports: nidaqmx.grpc_session_options (auto-generated noqa)

generated/nidaqmx/_dotenvpath.py

@@ -45,12 +45,27 @@ def _get_caller_path() -> Path | None:
     for frame, _ in traceback.walk_stack(inspect.currentframe()):
         if frame.f_code.co_filename:
             module_path = Path(frame.f_code.co_filename)
-            if module_path.exists() and not module_path.is_relative_to(package_path):
+            if _exists(module_path) and not module_path.is_relative_to(package_path):
                 return module_path
 
     return None
 
 
+# Path.exists() throws OSError when the path has invalid file characters.
+# https://github.com/python/cpython/issues/79487
+if sys.version_info >= (3, 10):
+
+    def _exists(path: Path) -> bool:
+        return path.exists()
+
+else:
+
+    def _exists(path: Path) -> bool:
+        import os
+
+        return os.path.exists(path)
+
+
 def _get_package_path() -> Path:
     """Get the path of this package."""
     module = sys.modules[__package__]

generated/nidaqmx/_feature_toggles.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import functools
-import sys
 from collections.abc import Callable
 from enum import Enum
 from typing import TYPE_CHECKING, TypeVar
@@ -14,12 +13,7 @@
 from nidaqmx.errors import FeatureNotSupportedError
 
 if TYPE_CHECKING:
-    from typing import ParamSpec
-
-    if sys.version_info >= (3, 11):
-        from typing import Self
-    else:
-        from typing_extensions import Self
+    from typing_extensions import ParamSpec, Self
 
     _P = ParamSpec("_P")
     _T = TypeVar("_T")

generated/nidaqmx/_lib.py

@@ -17,7 +17,7 @@
 )
 
 if TYPE_CHECKING:
-    from typing import TypeAlias
+    from typing_extensions import TypeAlias
 
 
 _DAQ_NOT_FOUND_MESSAGE = (

generated/nidaqmx/_library_interpreter.py

@@ -26,7 +26,7 @@
 from nitypes.waveform import AnalogWaveform, DigitalWaveform, SampleIntervalMode, Timing, ExtendedPropertyDictionary
 
 if TYPE_CHECKING:
-    from typing import TypeAlias
+    from typing_extensions import TypeAlias
 
 _logger = logging.getLogger(__name__)
 _was_runtime_environment_set = None

generated/nidaqmx/system/physical_channel.py

@@ -1,5 +1,7 @@
 # Do not edit this file; it was automatically generated.
 
+from __future__ import annotations
+
 import ctypes
 import numpy
 import pathlib

generated/nidaqmx/system/system.py

@@ -1,5 +1,7 @@
 # Do not edit this file; it was automatically generated.
 
+from __future__ import annotations
+
 import collections
 import ctypes
 import deprecation
@@ -23,6 +25,9 @@
 import nidaqmx.types
 from nidaqmx.system.device import _DeviceAlternateConstructor
 
+if typing.TYPE_CHECKING:
+    from typing_extensions import TypeAlias
+
 __all__ = ['System']
 
 
@@ -72,7 +77,7 @@ def devices(self):
         return DeviceCollection(self._interpreter)
 
 
-    DriverVersion: typing.TypeAlias = nidaqmx.types.DriverVersion
+    DriverVersion: TypeAlias = nidaqmx.types.DriverVersion
 
     @property
     def driver_version(self):

generated/nidaqmx/task/_in_stream.py

@@ -1,5 +1,7 @@
 # Do not edit this file; it was automatically generated.
 
+from __future__ import annotations
+
 from typing import Type, Optional, Union
 
 import numpy