Use actions/setup-python action to install Python for action

.github/workflows/lint-python.yml

@@ -5,11 +5,13 @@ on:
     paths:
       - '.github/workflows/lint-python.yml'
       - 'compilesketches/**.py'
+      - '.python-version'
 
   push:
     paths:
       - '.github/workflows/lint-python.yml'
       - 'compilesketches/**.py'
+      - '.python-version'
 
   # Scheduled trigger checks for workflow failures resulting from updates to the linting tools
   schedule:
@@ -32,6 +34,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
+      - name: Install Python
+        uses: actions/setup-python@v4.5.0
+        with:
+          python-version-file: .python-version
+
       - name: Run the set up script
         id: setup
         run: |
@@ -40,7 +47,7 @@ jobs:
       - name: Install flake8
         run: |
           source "${{ steps.setup.outputs.python-venv-activate-script-path }}"
-          "${{ steps.setup.outputs.python-command }}" \
+          python \
             -m \
               pip install \
                 flake8 \

.github/workflows/test-python.yml

@@ -4,12 +4,14 @@ on:
   pull_request:
     paths:
       - '.github/workflows/test-python.yml'
+      - '.python-version'
       - 'action-setup.sh'
       - 'compilesketches/**'
 
   push:
     paths:
       - '.github/workflows/test-python.yml'
+      - '.python-version'
       - 'action-setup.sh'
       - 'compilesketches/**'
 
@@ -39,6 +41,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
+      - name: Install Python
+        uses: actions/setup-python@v4.5.0
+        with:
+          python-version-file: .python-version
+
       - name: Run the set up script
         id: setup
         run: |
@@ -47,7 +54,7 @@ jobs:
       - name: Install test dependencies
         run: |
           source "${{ steps.setup.outputs.python-venv-activate-script-path }}"
-          "${{ steps.setup.outputs.python-command }}" \
+          python \
             -m \
               pip install \
                 --requirement "${{ env.PYTHON_PROJECT_TESTS_PATH }}/requirements.txt"
@@ -56,7 +63,7 @@ jobs:
         run: |
           source "${{ steps.setup.outputs.python-venv-activate-script-path }}"
           export PYTHONPATH="${{ env.PYTHON_PROJECT_PATH }}"
-          "${{ steps.setup.outputs.python-command }}" \
+          python \
             -m \
               coverage run \
                 --rcfile="${{ env.PYTHON_PROJECT_TESTS_PATH }}/.coveragerc" \
@@ -65,15 +72,15 @@ jobs:
                   pytest "${{ env.PYTHON_PROJECT_TESTS_PATH }}"
           # Generate coverage data file for consumption by `codecov/codecov-action`.
           # Otherwise that action generates the file using the system Python environment, which doesn't work.
-          "${{ steps.setup.outputs.python-command }}" \
+          python \
             -m \
               coverage xml \
                 -o "${{ github.workspace }}/${{ env.COVERAGE_DATA_FILENAME }}"
 
       - name: Display code coverage report
         run: |
           source "${{ steps.setup.outputs.python-venv-activate-script-path }}"
-          "${{ steps.setup.outputs.python-command }}" \
+          python \
             -m \
               coverage report
 

.python-version

@@ -0,0 +1 @@
+3.8

action-setup.sh

@@ -2,8 +2,6 @@
 
 # Set up the Python environment for the action's script to run in
 
-readonly PYTHON_PACKAGE_VERSION='3.8'
-
 # https://stackoverflow.com/a/29835459
 SCRIPT_PATH="$(
   CDPATH='' \
@@ -15,32 +13,20 @@ SCRIPT_PATH="$(
 )"
 readonly SCRIPT_PATH
 
-readonly PYTHON_COMMAND="python${PYTHON_PACKAGE_VERSION}"
 readonly PYTHON_VENV_PATH="${SCRIPT_PATH}/compilesketches/.venv"
 readonly PYTHON_VENV_ACTIVATE_SCRIPT_PATH="${PYTHON_VENV_PATH}/bin/activate"
 
-# Install Python
-sudo apt-get install --yes software-properties-common > /dev/null
-sudo add-apt-repository --yes ppa:deadsnakes/ppa > /dev/null
-sudo apt-get update --yes > /dev/null
-sudo apt-get install --yes python${PYTHON_PACKAGE_VERSION} > /dev/null
-echo "Using Python version: $("$PYTHON_COMMAND" --version)"
-
-sudo apt-get install --yes python3-setuptools > /dev/null
-sudo apt-get install --yes python${PYTHON_PACKAGE_VERSION}-venv > /dev/null
-
 # Create Python virtual environment
-"$PYTHON_COMMAND" -m venv --system-site-packages "$PYTHON_VENV_PATH"
+python -m venv --system-site-packages "$PYTHON_VENV_PATH"
 
 # Activate Python virtual environment
 # shellcheck source=/dev/null
 . "$PYTHON_VENV_ACTIVATE_SCRIPT_PATH"
 
 # Install Python dependencies
-"$PYTHON_COMMAND" -m pip install --upgrade pip > /dev/null
-"$PYTHON_COMMAND" -m pip install --quiet --requirement "${SCRIPT_PATH}/compilesketches/requirements.txt"
+python -m pip install --upgrade pip > /dev/null
+python -m pip install --quiet --requirement "${SCRIPT_PATH}/compilesketches/requirements.txt"
 
 # Set outputs for use in GitHub Actions workflow steps
 # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-commands-for-github-actions#setting-an-output-parameter
-echo "::set-output name=python-command::$PYTHON_COMMAND"
 echo "::set-output name=python-venv-activate-script-path::$PYTHON_VENV_ACTIVATE_SCRIPT_PATH"

action.yml

@@ -49,6 +49,11 @@ inputs:
 runs:
   using: composite
   steps:
+    - name: Install Python
+      uses: actions/setup-python@v4.5.0
+      with:
+        python-version-file: ${{ github.action_path }}/.python-version
+
     - name: Run the set up script
       id: setup
       shell: bash
@@ -74,4 +79,4 @@ runs:
         INPUT_SKETCHES-REPORT-PATH: ${{ inputs.sketches-report-path }}
       run: |
         source "${{ steps.setup.outputs.python-venv-activate-script-path }}"
-        "${{ steps.setup.outputs.python-command }}" "${{ github.action_path }}/compilesketches/compilesketches.py"
+        python "${{ github.action_path }}/compilesketches/compilesketches.py"