ci(tests): add python_tests.yaml and requirements.txt for that

Author: amyheather

.github/workflows/python_tests.yaml

@@ -0,0 +1,48 @@
+name: tests
+run-name: Run tests
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  tests:
+    permissions:
+      contents: write
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+            python-version: '3.10'
+          - os: ubuntu-latest
+            python-version: '3.10'
+          - os: ubuntu-latest
+            python-version: '3.11'
+          - os: ubuntu-latest
+            python-version: '3.12'
+          - os: windows-latest
+            python-version: '3.12'
+          - os: macos-latest
+            python-version: '3.12'
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Install python and dependencies
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'pip'
+      
+      - name: Install requirements (Windows)
+        if: runner.os == 'Windows'
+        run: python -m pip install -r requirements.txt
+      
+      - name: Install requirements (Unix)
+        if: runner.os != 'Windows'
+        run: pip install -r requirements.txt
+
+      - name: Run tests (with coverage for Ubuntu 3.13)
+        run: pytest

requirements.txt

@@ -0,0 +1,11 @@
+flake8==7.3.0
+lintquarto==0.7.0
+numpy==2.4.1
+pandas==2.3.3
+pip==25.3
+pylint==4.0.4
+pytest==9.0.2
+pytest-cov==7.0.0
+python==3.12.12
+scipy==1.17.0
+-e examples/python_package/.