Add type hints that work with python 3.9

Author: znicholls

pyproject.toml

@@ -11,6 +11,7 @@ dependencies = [
     "attrs>=24.3.0",
     "numpy>=1.26.0; python_version < '3.13'",
     "numpy>=2.1.0; python_version >= '3.13'",
+    "typing-extensions>=4.12.2",
 ]
 readme = "README.md"
 classifiers = [

requirements-docs-locked.txt

@@ -135,7 +135,7 @@ tomli==2.2.1 ; python_full_version < '3.11'
 tornado==6.4.2
 traitlets==5.14.3
 types-python-dateutil==2.9.0.20241206
-typing-extensions==4.12.2 ; python_full_version < '3.13'
+typing-extensions==4.12.2
 uri-template==1.3.0
 urllib3==2.3.0
 watchdog==6.0.0

requirements-incl-optional-locked.txt

@@ -19,4 +19,5 @@ pillow==11.3.0
 pyparsing==3.2.3
 python-dateutil==2.9.0.post0
 six==1.17.0
+typing-extensions==4.12.2
 zipp==3.23.0 ; python_full_version < '3.10'

requirements-locked.txt

@@ -4,3 +4,4 @@ attrs==25.3.0
 numpy==2.0.2 ; python_full_version < '3.10'
 numpy==2.2.6 ; python_full_version == '3.10.*'
 numpy==2.3.2 ; python_full_version >= '3.11'
+typing-extensions==4.12.2

src/example_fgen_basic/runtime_helpers.py

@@ -9,10 +9,11 @@
 from abc import ABC, abstractmethod
 from collections.abc import Iterable
 from functools import wraps
-from typing import Any, Callable, Concatenate, ParamSpec, TypeVar
+from typing import Any, Callable, TypeVar
 
 import attrs
 from attrs import define, field
+from typing_extensions import Concatenate, ParamSpec
 
 from example_fgen_basic.exceptions import NotInitialisedError, UnallocatedMemoryError