Add ci for python tests

.github/workflows/python-test.yml

@@ -0,0 +1,100 @@
+name: Python Tests
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    paths:
+      - python/**
+      - rust/lance-graph/**
+      - .github/workflows/python-test.yml
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: "-C debuginfo=1"
+
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Setup Rust
+        uses: actions-rust-lang/setup-rust-toolchain@v1
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: python
+      - name: Install dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y protobuf-compiler
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+      - name: Create virtual environment and install dependencies
+        working-directory: python
+        run: |
+          uv venv
+          source .venv/bin/activate
+          uv pip install maturin[patchelf]
+          uv pip install -e .[tests]
+      - name: Build Python extension
+        working-directory: python
+        run: |
+          source .venv/bin/activate
+          maturin develop
+      - name: Run tests
+        working-directory: python
+        run: |
+          source .venv/bin/activate
+          pytest python/tests/ -v
+      - name: Run doctests
+        working-directory: python
+        run: |
+          source .venv/bin/activate
+          if [ -f python/lance_graph/__init__.py ]; then
+            python -m doctest python/lance_graph/__init__.py || echo "No doctests found"
+          fi
+
+  lint:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+      - name: Install dependencies
+        working-directory: python
+        run: |
+          uv venv
+          source .venv/bin/activate
+          uv pip install -e .[dev]
+      - name: Run ruff format check
+        working-directory: python
+        run: |
+          source .venv/bin/activate
+          ruff format --check python/
+      - name: Run ruff lint
+        working-directory: python
+        run: |
+          source .venv/bin/activate
+          ruff check python/
+      - name: Run pyright type check
+        working-directory: python
+        run: |
+          source .venv/bin/activate
+          pyright

README.md

@@ -26,8 +26,11 @@ cargo test
 ```bash
 cd python
 uv venv --python 3.11 .venv      # create the local virtualenv
+source .venv/bin/activate         # activate the virtual environment
+uv pip install maturin[patchelf] # install build tool
 uv pip install -e '.[tests]'     # editable install with test extras
-uv run --extra tests pytest python/python/tests/test_graph.py
+maturin develop                   # build and install the Rust extension
+pytest python/tests/ -v          # run the test suite
 ```
 
 > If another virtual environment is already active, run `deactivate` (or
@@ -59,11 +62,19 @@ result = query.execute({"Person": people})
 print(result.to_pydict())  # {'name': ['Bob', 'David'], 'age': [34, 42]}
 ```
 
-Optional linters and type checks:
+### Development workflow
+
+For linting and type checks:
 
 ```bash
-uv run --extra dev ruff check python
-uv run --extra dev pyright
+# Install dev dependencies and run linters
+uv pip install -e '.[dev]'
+ruff format python/              # format code
+ruff check python/               # lint code
+pyright                          # type check
+
+# Or run individual tests
+pytest python/tests/test_graph.py::test_basic_node_selection -v
 ```
 
 The Python README (`python/README.md`) contains additional details if you are

python/README.md

@@ -9,15 +9,31 @@ to manage dependencies inside a project-local `.venv`.
 ```bash
 cd python
 uv venv --python 3.11 .venv
+source .venv/bin/activate
+uv pip install maturin[patchelf]
 uv pip install -e '.[tests]'
-uv run --extra tests pytest python/python/tests/test_graph.py
+maturin develop
+pytest python/tests/ -v
 ```
 
-For linting and type checks install the optional `dev` extra:
+## Development workflow
+
+For linting and type checks:
 
 ```bash
-uv run --extra dev ruff check python
-uv run --extra dev pyright
+# Install dev dependencies
+uv pip install -e '.[dev]'
+
+# Run linters and type checker
+ruff format python/              # format code
+ruff check python/               # lint code
+pyright                          # type check
+
+# Run specific tests
+pytest python/tests/test_graph.py::test_basic_node_selection -v
+
+# Rebuild extension after Rust changes
+maturin develop
 ```
 
 > If another virtual environment is already active, run `deactivate` (or

python/python/lance_graph/__init__.py

@@ -5,7 +5,10 @@
 import importlib.util
 import sys
 from pathlib import Path
-from types import ModuleType
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from types import ModuleType
 
 
 def _load_bindings() -> ModuleType:

python/python/tests/test_graph.py

@@ -3,7 +3,6 @@
 
 import pyarrow as pa
 import pytest
-
 from lance_graph import CypherQuery, GraphConfig