Added workflow to check per PR

Author: cdorsman

.github/lint_pr.yml

@@ -0,0 +1,69 @@
+name: lint_python
+on: [pull_request, push]
+jobs:
+  lint_python:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0  # To get all history for git diff commands
+          
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.12
+          
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+          
+      - name: Get changed Python files
+        id: changed-files
+        run: |
+          if [ "${{ github.event_name }}" == "pull_request" ]; then
+            # For PRs, compare against base branch
+            CHANGED_FILES=$(git diff --name-only --diff-filter=ACMRT origin/${{ github.base_ref }} HEAD | grep '\.py$' || echo "")
+          else
+            # For pushes, use the before/after SHAs
+            CHANGED_FILES=$(git diff --name-only --diff-filter=ACMRT ${{ github.event.before }} ${{ github.event.after }} | grep '\.py$' || echo "")
+          fi
+          echo "files=$CHANGED_FILES" >> $GITHUB_OUTPUT
+          echo "Changed Python files: $CHANGED_FILES"
+          
+      - name: Lint with flake8
+        if: ${{ steps.changed-files.outputs.files != '' }}
+        run: |
+          echo "Linting files: ${{ steps.changed-files.outputs.files }}"
+          flake8 ${{ steps.changed-files.outputs.files }} --count --show-source --statistics
+        continue-on-error: true
+        
+      - name: Format check with isort and black
+        if: ${{ steps.changed-files.outputs.files != '' }}
+        run: |
+          echo "Checking format with isort for: ${{ steps.changed-files.outputs.files }}"
+          isort --profile black --check ${{ steps.changed-files.outputs.files }}
+          echo "Checking format with black for: ${{ steps.changed-files.outputs.files }}"
+          black --check ${{ steps.changed-files.outputs.files }}
+        continue-on-error: true
+        
+      - name: Type check with mypy
+        if: ${{ steps.changed-files.outputs.files != '' }}
+        run: |
+          echo "Type checking: ${{ steps.changed-files.outputs.files }}"
+          mypy --ignore-missing-imports ${{ steps.changed-files.outputs.files }}
+        continue-on-error: true
+        
+      - name: Run tests with pytest
+        run: |
+          pytest ./patterns
+          pytest --doctest-modules ./patterns || true
+        continue-on-error: true
+        
+      - name: Check Python version compatibility
+        if: ${{ steps.changed-files.outputs.files != '' }}
+        run: pyupgrade --py312-plus ${{ steps.changed-files.outputs.files }}
+        continue-on-error: true
+        
+      - name: Run tox
+        run: tox
+        continue-on-error: true