New: test various Python versions

.github/workflows/check-code.yml

@@ -19,6 +19,9 @@ jobs:
   python-tests:
     # The type of runner that the job will run on
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9.x", "3.10.x", "3.11.x", "3.12.x"]
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
@@ -27,17 +30,20 @@ jobs:
       #   uses: styfle/[email protected]
       #   with:
       #     access_token: ${{ github.token }}
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+            python-version: ${{ matrix.python-version }}
+
+      # You can test your matrix by printing the current Python version
+      - name: Show Python version
+        run: python -c "import sys; print(sys.version)"
 
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Check out Repository
         uses: actions/checkout@v3
 
-      # We now test with Python 3.10
-      - name: Set up Python
-        uses: actions/setup-python@v4
-        with:
-          python-version: '3.10.9'
-
       # Runs a set of commands using the runners shell
       - name: Set up Path
         run: echo "$HOME/.local/bin" >> $GITHUB_PATH
@@ -55,9 +61,6 @@ jobs:
       - name: Install Python Packages
         run: pip install -r requirements.txt
 
-      - name: Check Python Version
-        run: python --version
-
       - name: Code
         run: make -k code