Initial export of Penzai.

PiperOrigin-RevId: 625433936

.github/workflows/unittests.yml

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+name: Unittests
+
+# Allow to trigger the workflow manually (e.g. when deps changes)
+on: [push, workflow_dispatch]
+
+jobs:
+  unittest-job:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.ref }}
+      cancel-in-progress: true
+
+    steps:
+    - uses: actions/checkout@v3
+
+    # Install deps
+    - uses: actions/setup-python@v4
+      with:
+        python-version: 3.10
+        # Uncomment to cache of pip dependencies (if tests too slow)
+        # cache: pip
+        # cache-dependency-path: '**/pyproject.toml'
+
+    - run: pip --version
+    - run: pip install -e .[extras]
+    - run: pip freeze
+
+    # Run tests
+    - name: Run tests
+      run: python run_tests.py

.gitignore

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+# Compiled python modules.
+*.pyc
+
+# Byte-compiled
+_pycache__/
+.cache/
+
+# Poetry, setuptools, PyPI distribution artifacts.
+/*.egg-info
+.eggs/
+build/
+dist/
+poetry.lock
+
+# Tests
+.pytest_cache/
+
+# Type checking
+.pytype/
+
+# Other
+*.DS_Store
+
+# PyCharm
+.idea