Remove support for Python 3.8

.github/workflows/code.yml

@@ -35,13 +35,8 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"] # can add windows-latest, macos-latest
-        python: ["3.8", "3.9", "3.10"]
-        install: ["-e .[dev]"]
-        # Make one version be non-editable to test both paths of version code
-        include:
-          - os: "ubuntu-latest"
-            python: "3.8"
-            install: ".[dev]"
+        python: ["3.9", "3.10"]
+        install: [".[dev]", "-e .[dev]"]
 
     runs-on: ${{ matrix.os }}
     env:

docs/developer/how-to/pin-requirements.rst

@@ -46,7 +46,7 @@ of the dependencies and sub-dependencies with pinned versions.
 You can download any of these files by clicking on them. It is best to use
 the one that ran with the lowest Python version as this is more likely to
 be compatible with all the versions of Python in the test matrix.
-i.e. ``requirements-test-ubuntu-latest-3.8.txt`` in this example.
+i.e. ``requirements-test-ubuntu-latest-3.9.txt`` in this example.
 
 Applying the lock file
 ----------------------

docs/developer/tutorials/dev-install.rst

@@ -16,7 +16,7 @@ Install dependencies
 --------------------
 
 You can choose to either develop on the host machine using a `venv` (which
-requires python 3.8 or later) or to run in a container under `VSCode
+requires python 3.9 or later) or to run in a container under `VSCode
 <https://code.visualstudio.com/>`_
 
 .. tab-set::

docs/user/tutorials/installation.rst

@@ -4,7 +4,7 @@ Installation
 Check your version of python
 ----------------------------
 
-You will need python 3.8 or later. You can check your version of python by
+You will need python 3.9 or later. You can check your version of python by
 typing into a terminal::
 
     $ python3 --version

pyproject.toml

@@ -7,7 +7,6 @@ name = "tickit"
 classifiers = [
     "Development Status :: 4 - Beta",
     "License :: OSI Approved :: Apache Software License",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
 ]
@@ -28,7 +27,7 @@ dependencies = [
 dynamic = ["version"]
 license.file = "LICENSE"
 readme = "README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 
 [project.optional-dependencies]
 dev = [
@@ -127,8 +126,8 @@ skipsdist=True
 # Don't create a virtualenv for the command, requires tox-direct plugin
 direct = True
 passenv = *
-allowlist_externals = 
-    pytest 
+allowlist_externals =
+    pytest
     pre-commit
     mypy
     sphinx-build

src/tickit/core/management/event_router.py

@@ -1,9 +1,9 @@
 from collections import defaultdict, deque
+from functools import cached_property
 from typing import DefaultDict, Dict, Iterable, Mapping, Optional, Set, Union, overload
 
 from tickit.core.components.component import ComponentConfig
 from tickit.core.typedefs import ComponentID, ComponentPort, PortID
-from tickit.utils.compat.functools_compat import cached_property
 
 #: A mapping of component output ports to component input ports with defaults
 Default_Wiring_Struct = DefaultDict[