Drop support for Python below 3.12

Author: MetRonnie

.github/workflows/create-conda-envs.yml

@@ -25,7 +25,7 @@ jobs:
     timeout-minutes: 30
     strategy:
       matrix:
-        python: ['3.9']
+        python: ['3.x']
     steps:
       - name: checkout cylc-doc
         uses: actions/checkout@v5

.github/workflows/deploy.yml

@@ -67,7 +67,7 @@ jobs:
       - name: configure python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.x'
 
       - name: configure git
         uses: cylc/release-actions/configure-git@v1
@@ -105,7 +105,7 @@ jobs:
         uses: ./docs/.github/actions/create-conda-envs
         if: ${{ ! inputs.skip_conda_environment_check }}
         with:
-          python_version: '3.9'
+          python_version: '3.x'
           working_directory: ./docs
 
       - name: checkout gh-pages

.github/workflows/nightly.yml

@@ -64,7 +64,7 @@ jobs:
       - name: configure python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.x'
 
       - name: checkout cylc-doc
         uses: actions/checkout@v5

.github/workflows/test.yml

@@ -37,12 +37,12 @@ jobs:
       - name: configure python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.x'
 
       - name: configure node
         uses: actions/setup-node@v4
         with:
-            node-version: '16'
+            node-version: 'lts/*'
 
       - name: checkout cylc-doc
         uses: actions/checkout@v5

.github/workflows/undeploy.yml

@@ -41,7 +41,7 @@ jobs:
       - name: configure python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.x'
 
       - name: configure git
         uses: cylc/release-actions/configure-git@v1

setup.cfg

@@ -36,8 +36,6 @@ classifiers =
     License :: OSI Approved :: GNU General Public License v3 (GPLv3)
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Scientific/Engineering :: Atmospheric Science

src/installation.rst

@@ -12,13 +12,12 @@ Quick Installation
 
 Cylc runs on Unix-like systems including Linux and Mac OS.
 
-Via Conda (recommended)
-^^^^^^^^^^^^^^^^^^^^^^^
-
 .. admonition:: Supported Python versions
 
-   * cylc-flow supports Python 3.8+.
-   * cylc-uiserver supports Python 3.9+.
+   Cylc supports Python 3.12+.
+
+Via Conda (recommended)
+^^^^^^^^^^^^^^^^^^^^^^^
 
 .. tip::
 
@@ -46,11 +45,6 @@ Via Conda (recommended)
 Via Pip (+npm)
 ^^^^^^^^^^^^^^
 
-.. admonition:: Supported Python versions
-
-   * cylc-flow supports Python 3.7+.
-   * cylc-uiserver supports Python 3.9+.
-
 .. important::
 
    We recommend installing Cylc versions into virtual environments.

src/reference/changes.rst

@@ -22,6 +22,9 @@ For more detail see the component changelogs:
 
 ----------
 
+Cylc 8.6
+--------
+
 .. TODO: Modify these URL's and uncomment this block before release
 
    .. admonition:: Cylc Components
@@ -33,6 +36,13 @@ For more detail see the component changelogs:
    :cylc-rose: `1.5 <https://github.com/cylc/cylc-rose/blob/master/CHANGES.md>`__
    :rose: `2.4 <https://github.com/metomi/rose/blob/master/CHANGES.md>`__
 
+Supported Python versions
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The minimum supported Python version is now 3.12.
+
+
+----------
 
 Cylc 8.5
 --------
@@ -282,6 +292,8 @@ configurations in
 `tornado <https://www.tornadoweb.org/en/stable/web.html#tornado.web.Application.settings>`_.
 
 
+----------
+
 Cylc 8.4
 --------
 
@@ -391,6 +403,8 @@ An info view has been added, displaying
    :width: 80%
 
 
+----------
+
 Cylc 8.3
 --------