Revert "Remove Python 3.9, add 3.12"

.github/workflows/build-test.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         name: [ubuntu, windows, macos]
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11"]
 
         include:
           - name: ubuntu
@@ -24,7 +24,7 @@ jobs:
             os: macos-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v2
       - name: Install Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:

.github/workflows/python-publish.yml

@@ -8,9 +8,9 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v2
     - name: Set up Python
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v1
       with:
         python-version: '3.x'
     - name: Install dependencies

README.md

@@ -6,8 +6,8 @@
 # typhon - Tools for atmospheric research
 
 ## Installation
-Typhon requires Python version 3.10 or higher. The recommended way to get Python
-is through [Miniforge3]. But of course, any other Python distribution is also
+Typhon requires Python version 3.6 or higher. The recommended way to get Python
+is through [Anaconda]. But of course, any other Python distribution is also
 working.
 
 ### Stable release
@@ -53,5 +53,5 @@ A recent build of the documentation is accessible
 Kindly note that bleeding edge features might not be covered.
 
 [Sphinx]: http://www.sphinx-doc.org
-[Miniforge3]: https://github.com/conda-forge/miniforge#miniforge
+[Anaconda]: https://www.continuum.io/downloads
 [pytest]: https://docs.pytest.org/

environment.yml

@@ -1,6 +1,6 @@
 name: typhon
 dependencies:
-        - python>=3.10
+        - python>=3.9
         - cartopy
         - cython
         - fsspec!=2023.12.0,!=2023.12.1,!=2024.3.1

setup.py

@@ -71,11 +71,11 @@
         "Intended Audience :: Science/Research",
         "Topic :: Scientific/Engineering :: Atmospheric Science",
         "License :: OSI Approved :: MIT License",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
     ],
-    python_requires="~=3.10",
+    python_requires="~=3.9",
     include_package_data=True,
     install_requires=[
         "docutils",